What was found
PRIOR TO DEPARTURE FOUND SPARKS & SMOKE COMING FROM LT APU ACCESS DOOR AS WELL AS A HOLE ON SAME DOOR. FLIGHT CREW REPORTED NO WARNING INDICATION IN COCKPIT. APU SHUTDOWN & FIRE BOTTLE DISCHARGED. PRELIMINARY INSPECTIONS IN WORK & HAVE REVEALED DAMAGE TO APU ACCESS DOORS, FUSELAGE SKIN, FASTENERS & EXHAUST DUCTING. DAMAGE REPAIRED IAW WITH THE FOLLOWING ENGINEERING ORDERS 4453B026 REV 1, 4453B027 REV 2, 4453B025, 4452A208 REV 1 & 4453B024 REV 1. APU & GENERATOR DEFERRED IAW MEL 242102A.