As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED DUE TO NO WATER PRESSURE. PRE-SELECT OVERFLOW VALVE FOUND TO STICK IN SEMI-CLOSED POSITION. PRIOR TO REPLACEMENT- CHECKED LINKAGES, INDICATION & VALVE OPERATION. VLV OPERATION NORMAL WITH PRE-SELECT KNOB MOVEMENT AT FWD SERVICE PANEL. PRECAUTIONARY: REPLACED PRE-SELECT OVERFLOW VALVE. OPS CHECK OK.