Narrative:

After leveling off at FL370; I was informed by the flight attendants that there was no water throughout the entire aircraft. I then called dispatch on the VHF radio and got a phone patch with maintenance control and discussed the issue with them. It was determined that the probable cause was that the water fill valve was not fully closed when the aircraft was serviced last. With concurrence and agreement with my first officer; dispatch; maintenance control; and myself; the decision was made to continue the flight. After a few minutes the flight attendants again called the cockpit and informed me that the aft galley floor was vibrating much more that usual. The vibration was described as like being in a massage chair; and that the entire aft galley was vibrating. I again called dispatch and got a phone patch with maintenance control. The possible causes discussed were: 1. External door or item coming off. 2. Water pump compressor running when it should not be and a possibility of an overheat and fire. 3. Unknown items. After a long and detailed discussion; it was agreed upon by all parties that the prudent and safe course of action was to divert to ZZZ to determine the actual cause of the vibration. Since we were going to an outstation where maintenance is questionable (mexico); flying over high terrain and not many good places to divert if it became necessary; this seemed to be the best course of action. We landed in ZZZ with no incidents.

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Original NASA ASRS Text

Title: B757 Captain is informed of no water pressure and a vibration in the galley floor upon leveling off at FL370. The crew elects to divert for maintenance inspection.

Narrative: After leveling off at FL370; I was informed by the Flight Attendants that there was no water throughout the entire aircraft. I then called Dispatch on the VHF radio and got a phone patch with Maintenance Control and discussed the issue with them. It was determined that the probable cause was that the water fill valve was not fully closed when the aircraft was serviced last. With concurrence and agreement with my First Officer; Dispatch; Maintenance Control; and myself; the decision was made to continue the flight. After a few minutes the flight attendants again called the cockpit and informed me that the aft galley floor was vibrating much more that usual. The vibration was described as like being in a massage chair; and that the entire aft galley was vibrating. I again called Dispatch and got a phone patch with Maintenance Control. The possible causes discussed were: 1. External door or item coming off. 2. Water pump compressor running when it should not be and a possibility of an overheat and fire. 3. Unknown items. After a long and detailed discussion; it was agreed upon by all parties that the prudent and safe course of action was to divert to ZZZ to determine the actual cause of the vibration. Since we were going to an outstation where maintenance is questionable (Mexico); flying over high terrain and not many good places to divert if it became necessary; this seemed to be the best course of action. We landed in ZZZ with no incidents.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.