As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLT 4233 - THE CREW REPORTED THAT AFTER THEY STARTED THE APU, THEY GOT THE LAV AND BAGGAGE SMOKE WARNING ALONG WITH SMOKE IN THE REAR OF THE AIRCRAFT. MAINTENANCE INSPECTED THE APU AND PLACED IT ON MEL 49-00-00 CONTROL NR 18372B CAT 'C'. THE AIRCRAFT WAS RELEASED TO SERVICE. (X)