What was found
AIRCRAFT WAS GROUNDED: ON DESCENT INTO SAN DIEGO -POWER AT IDLE VERY STRONG MUSTY ODOR FROM PACKS UNTILL ENGINE SHUTDOWN. MORE NOTICABLE IN FLIGHT DECK THAT THE CABIN. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. **SUPPLEMENTAL REPORT FOR AALA202304117123: MAINTENANCE FOUND THE APU TO BE LEAKING OIL AT THE COMPRESSOR INLET DUE TO AN INTERNAL LEAK. THE APU WAS REPLACED PER TASK CARD 26L31049003 AND A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED. **(CLOSED)