What was found
AIRCRAFT WAS GROUNDED. ACRID ODOR FROM TOP FL 180 TO LANDING AND GATE ARRIVAL. REPORTED BY FWD CABIN AND FWD GALLEY AREA. OBSERVED IN FLT DECK SUSPECT AIR COND/APU BLEED AIR. INSPECTED APU INTAKE PLENUM. FOUND SIGNIFICANT EVIDENCE OF OIL COLLECTION AT PLENUM FRAME CHANNEL, SHAFT AND SCREEN AREA. ACCOMPLISHED VISUAL INSPECTION OF APU FOR EXTERNAL OIL LEAKS, REF J/C 26L00021001. NO OIL LEAKS FOUND AT THIS TIME. MOC NOTIFIED REMOVED MEL 49-1B, C/N 1542C25.