As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - ALL LAVATORIES NOT WORKING IN FLIGHT, HEADING BACK TO LAX. PERFORMED CIDS POWER UPTEST AND FAULTED 300RH8. REMOVED AND REPLACED DEU-B 300RH8 IAW AMM 23-73-47 PB 401, OPS CHECK OF ALL LAV AS OKAY. AC OK TO CONTINUE. ORIG SUB DATE: 1/3/2023