As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED SMOKE IN CABIN (4/2, 4/6,4/8) BLUE SMOKE IN CABIN WHEN RUNNING RIGHT AC PACK FROM APU. MAINTENANCE PERSONNEL FOUND OIL LEAKING ON LEFT SIDE OF APU BETWEEN PLENUM AND ACCESSORY GEARBOX DRIVE. REMOVED TIGHTENED LOOSE OIL LINE AND RE-INSTALLED APU IAW TASK CARD R0594902, OPS AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.