As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV PROBLEM, FLIGHT DIVERTED. FOUND AFT WASTE TANK PRECHARGE SHUTOFF VALVE FROZEN IN CLOSED POSITION. NO PRESERVICE VLV STOCKED HNL. 585-5461. NEED TO ACP PRESERVICE OF AFT TANK PER MM. ADD PRECHARGE TO AFT WASTE TANK BY FLUSHING IT DOWN TOILET NEAREST THE WASTE TANKS. REPLACED AFT TANK PRE CHARGE SHUTOFF VALVE PER MM. CHECK AND PRE CHARGE TANK TO 5 GALLONS AND SHUT OFF. TEST AND LEAK CK OK.