What was found
AIRCRAFT WAS GROUNDED: THROUGH 24000 FT. STRONG ACRID/SMOKE/BURNING OIL SMELL.FLIGHT ATTENDANT NOTICED SAME AND ESPECIALLY WHEN PARKED AT GATE .FIRST OFFICER NOTICED STRONGER SMELL AT GATE ALSO. MAINTENANCE HAS ISOLATED THE SOURCE OF THE ODOR TO THE APU. **SUPPLEMENT REPORT FOR AALA202204289883: MAINTENANCE FOUND THE APU DOOR SHROUD DRAIN TUBES BENT/ LEAKING AND NOT DRAINING OVERBOARD STRAIGHTENED DRAIN TUBES AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK WITH NO ODORS NOTED. ** (CLOSED)