What was found
APU SMOKE: AFTER APU START THE ENTIRE PLANE, COCKPIT AND CABIN, FILL WITH SMOKE. HIGHLY RECOMMEND CLEANING ENTIRE INTERIOR BEFORE PUTTING CREW OR PAX BACK ON PLANE. // SIGNOFF // REMOVED APU P/N 3800785-1 S/N P-879 DUE TO SMOKE IN CABIN, IAW CE-680A MM 49-10-00 INSTALLED REPAIRED APU P/N 3800785-1 S/N P-833 WITH 2676.8 HRS AND 3492 CYCLES DUE TO SMOKE IN CABIN, OPS CHECK GOOD LEAK CHECK GOOD JAW CE-680A MM 49-10-00. PERFORMED LONG APU RUN W/ BLEED AIR ON AND NO SMOKE NOTED. CLOSED ALL PANELS, TOROUE WRENCH: JE0899, OK TO CONTINUE.