As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LAV SMOKE MASTER CAUTION ILLUMINATED DURING CLIMB THEN EXTINGUISHED, FA'S REPORTED NO SMOKE OR FUMES PRESENT. REMOVED FROM SERVICE. CMC SHOWS NO CORROLATED FAULT CODES. C/W LAVATORY SMOKE DETECTOR SYSTEM TESTING-CHECKING REF AMM 26-14-01-700-801-A AND LAVATORY SMOKE DETECTOR FUNCTIONAL TEST, REF AMM 26-14-01-720-801-A. ALL CHECKS GOOD. OK FOR CONTINUED SERVICE.