What was found
ON TAXI IN AFTER APU START, SMELLED AN ELECTRICAL SMELL IN THE COCKPIT AND CABIN. F/AS NOTICED A VERY LIGHT HAZE. HAZE AND SMELL STARTED TO CLEAR WITH NO ACTION AFTER 1-2 MINUTES. RAN APU AND SWAPPED BETWEEN APU AND EXT POWER. NTF. RAN ENGINES W/O APU FOR A WHILE TO TRY AND DUPLICATE FAULT CONDITIONS. TURNED ON APU. CYCLED BETWEEN ENG AND APU BLEED /POWER. NTF. VERIFIED RECIRC FAN AND FILTERS WORKING AND IN GOOD CONDITION. RAN APU FOR EXTENDED PERIOD. NTF. C/W ENGINE RUN FOR ELIMINATION OF RESIDUAL ODORS PER A220 EFIM SOLUTION ID #1-16379. NTF (STILL REQ R/R OF RECIRC FILTERS PER MCC REQUEST. R/R RECIRCULATION FILTERS PER A220 AMP 21-22. NO LEAKS NOTED. (LP# 5439210)