As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE TOMC CONTROLLER AND SENIOR MANAGER CONCUR THAT THE AIRCRAFT CAN BE RELEASED BACK TO SERVICE AFTER EXPERIENCING A DIVERSION OR AIR TURN BACK DUE TO A MECHANICAL REASON LOCKED BY SYSTEM. UNLOCKING AIRCRAFT DIVERTED INTO BOSTON FOR LAV SERVICING. NO MECHANICAL ISSUES FOUND. LAV SYSTEM HAS BEEN DUMPED AND SERVICED.