What was found
APU "FAULT" LIGHT ILLUMINATED 1 MINUTE AFTER APU SWITCH WAS PLACED TO OFF. FAULT LIGHT EXTINGUISHED AFTER APPROXIMATELY 5 MINUTES. ACFT GROUNDED. APU CURRENT STATUS SHOWS FAULT CODE 49-61223 INLET TEMP SENSOR SHOWS SHORT CIRCUIT. NO OTHER FAULTS LOGGED AND NO PREVIOUS HISTORY OF FAULT RECORDED IN FAULT HISTORY. ACCOMPLISHED FIM TASK 49-60 TASK 812. FOUND P21 PLUG AT SENSOR WITH CORROSION. CLEANED CORROSION AND RECONNECTED P21. REF SWPM 20-61-01. CURRENT STATUS FAULT CLEARED. STARTED APU WITH NO ACTIVE FAULTS. GROUND VERIFICATION GOOD.