What was found
AIRCRAFT WAS GROUNDED: AFTER APU AND ENGINE START SLIGHT OIL ODOR THAT CLEARED AFTER A FEW MINUTES. ODOR RETURNED AT TOP OF DESCENT AND THEN CLEARED AGAIN. **SUPPLEMENTAL REPORT FOR AALA202110061717: COMPLETED APU LOAD COMPRESSOR CLEANING IAW AMM 49-20-00-100-004-A AND DECONTAMINATION TASK CARD 26L00021004, APU SMOKE AND ODOR FUMES TROUBLESHOOTING TASK CARD 26L00021002, INITIAL TROUBLE SHOOTING TASK CARD 26L00021001. NO ODOR DETECTED. A FOLLOW UP INSPECTION OF THE APU BAY, APU BAY DOORS AND FUSELAGE EXTERIOR FOR LEAKS WAS ACCOMPLISHED WITH NO LEAKS NOTED.