As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL LAVS DO NOT FLUSH. GROUNDED - YES. DIVERSION TIME 27 MINUTES - C/W B737-800 FIM 38-30 TASK 811 ON STEP F (3) A1,2 LAVS WORK. FOUND PLASTIC BAG OVER WATER SEPARATOR. CHECK ALL LAVS ALL BUT LAV G OPS GOOD. REF LOG 60226502 AFT L/H FWD LAV, (LAV "G" ) WONT STOP FLUSHING. ALWAYS SUCKING AIR. REPLACED AFT LAV L/H FWD "G" ASSY. OPS CHECKS GOOD. B737-800 AMM 38-32-01