What was found
ELECTRICAL/AC SMOKE IN CABIN. EVACUATED AIRCRAFT-MECHANIC NOTIFIED. PERFORMED ENG RUNS/BLEED AIR CHECKS IAW. NO SMOKE NOTED. OK FOR SERVICE. SMOKE IN CABIN ON APU START WITH PACKS ON APU. DEFERRED APU IAW MEL, CAT C AUTHORIZATION NR 48877. DM48877 IS DUE BY 6/12/04, WITH MAINTENANCE COMMENTS OF (6/02 STRONG OIL SMELL IN CABIN WHEN PACKS RUN OFF APU. NO SMELL REPORTED WHEN SUPPLIED BY ENGINES IN FLIGHT. EVACUATED THE AIRCRAFT. CAPTAIN DID NOT DECLARE AN EMERGENCY.