As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTED BURNING PLASTIC ODOR FROM F/O SIDE REAR LAV. SMOKE ALARM MOMENTARILY ACTIVATED. NO VISIBLE SMOKE OBSERVED.<[01] ACCOMPLISHED SMOKE OR FUMES IN CABIN CONDITIONAL INSPECTION PER AMM 05-51-56; FOUND WATER HEATER FAILED. OK TO CONTINUE PER MEL 25-10-01; C/W SP # 1B. AUTH # 128777.;[02] R+R AFT RH LAV HEATER REF AM 38-13-01 OPS CHECK GOOD. THIS CLEARS MEL 25-10-01