What was found
TWO MINUTES AFTER APU START SEQUENCE WAS COMPLETE, CABIN FILLED WITH HEAVY SMOKE. REMOVED APU ACCESS PANELS. DRAINED APU OIL. REMOVED APU STARTER GENERATOR P/N: 9914685-1 S/N: P2120. REMOVED APU PN: 3800785-1 SN: P-241. TRANSFER FIRE LOOP ASSY AND HARDWARE FOR CONNECTIVITY OF FUEL LINE AND APU STARTER GENERATOR ON TO NEW APU PN: 3800785-1 SN: P-383 IAW 680MM CH 26-10-10. SAFETY APU MOUNTS AND HARDWARE SUPPORTING FIRE LOOP. REMOVAL AND INSTALLATION OF NEW APU IAW 680MM CH 49-10-00. INSTALLED APU AND STARTER GENERATOR. GENERATOR CONNECTION VERIFIED. SERVICED APU WITH 0.9 QT OF BP TURBO OIL 2380 IAW HONEYWELL MM RE100(CS) CH:49-20-00. RAN APU IAW HONEYWELL MM RE100 (CS) CH 49-40-00 STARTING PROCEDURES, OPS CHECK AND LEAK CHECK GOOD. VERIFIED WORK PERFORMED. OK TO CLOSE APU ACCESS. FINALIZE OIL SERVICING PROCEDURES AND SEALED BOND JUMPERS. CLOSED APU ACCESS.