What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) The pilot reported in the aircraft logbook on logpage #2407649, just after lift off APU fire light came on. The pilot followed the (qrh) quick run up handbook check list. The aircraft returned to ind. Maintenance personnel opened the APU cowling and inspected the area and no discrepancies were found. The APU fire detection system and the APU was deferred per MEL 26-8. Line maintenance personnel at mdw removed and replaced the forward left wire harness for APU fire detection system per mm 26-20. The system operational checked good. The aircraft was returned to service. No further investigation required by this ASI.
As the FAA filed it
(-23) THE PILOT REPORTED IN THE AIRCRAFT LOGBOOK ON LOGPAGE #2407649, JUST AFTER LIFT OFF APU FIRE LIGHT CAME ON. THE PILOT FOLLOWED THE (QRH) QUICK RUN UP HANDBOOK CHECK LIST. THE AIRCRAFT RETURNED TO IND. MAINTENANCE PERSONNEL OPENED THE APU COWLING AND INSPECTED THE AREA AND NO DISCREPANCIES WERE FOUND. THE APU FIRE DETECTION SYSTEM AND THE APU WAS DEFERRED PER MEL 26-8. LINE MAINTENANCE PERSONNEL AT MDW REMOVED AND REPLACED THE FORWARD LEFT WIRE HARNESS FOR APU FIRE DETECTION SYSTEM PER MM 26-20. THE SYSTEM OPERATIONAL CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE. NO FURTHER INVESTIGATION REQUIRED BY THIS ASI.