As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASKCARD 78349002 FOUND FAULT MSG 49 15218 APU INLET DOOR DID NOT CLOSE. TROUBLESHOT FOUND POSITION SWITCH S284 LOOSE. TIGHTENED SWITCH IAW TASK 49 15 41 400 801. DID BITE CHECKED. FAULT CLEARED BUT THEN RE-APPEARED. SUSPECT BAD SWITCH. VERIFIED S284 IS BAD. REPLACED S284 WITH NEW ONE. ACCOMP DOOR POSITION SWITCH INST TEST, TEST PASS REF M/M 49 15 41 400 801.