What was found
SMOKE FUME EVENT DURING ENGINE 1 START AFT CABIN WAS BAD FLT DEC K HAD FUMES TOO. INSPECTED APU IAW TASK 49-00-00-200-816-A, FOUND SMOKE AND OIL RESIDUE IN THE COMPARTMENT. REMOVED HEAT SHIELD AROUND THE AFT TURBINE SECTION FOUND UPPER & LOWER LUBRICATION LINES SEEPING OIL. CLEANED BURNT RESIDUE AND REINSTALLED SHIELD. SUSPECT OIL THAT LEAKED WENT INTO APU INLET WHICH SMOKED THE CABIN. NO LEAKS WITH APU NOT IN OPS. APPROVED FOR MEL 4910B PLACED APU ON MEL 4910B AND DEACTIVATED. INSTALLED STICKER NEXT TO START SWITCH AND PULLED BREAKERS. REMOVED APU REF AMM 49-11-98-890-C1. UP TO STEP J GETTING READY FOR APU INSTALLATION