As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATTEMPTED START ON APU AT 2305 Z (PRE FLIGHT) DID NOT START AND FAULT LIGHT APPEARED. INSPECTED AND CLEANED CONNECTOR FOR APU FCU. RE-INSTALLED CONNECTOR. INITIATED START FOR APU START NORMAL. APPLIED ELECTRICAL AND AIR LOAD OPS NORMAL. INITIATED SEVERAL MORE STARTS ALL NORMAL. WORK PERFORMED IAW AMM 49 60 00 FAULT ISOLATION MANUAL. APU GROUND OPS VERIFICATION GOOD.