As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ALL LAVATORY HAVE NO ELECTRICAL POWER TO FLUSH THE TOILETS AND THE TOILETS ARE FULL OF FLUID; AIRCRAFT LANDED SAFELY AT MIA. PERFORMED FIM TASK 38-32-00-810-803. CLEARED BLOCKAGE OF AFT LEFT HAND LAVATORY, AND OPERTIONAL CHECKED GOOD ALL LAVATORY. PER AMM 38-33-03.