What was found
CREW REPORTS HEAVY ELECTRICAL BURNING SMELL IN FLIGHT DECK AND THROUGH OUT THE CABIN WITH VISIBLE GREY SMOKE THROUGHOUT AIRCRAFT. LOCKING UNLOCKED WAS NOT AN ELECTRICAL SMELL. STARTED APU, TURNED ON APU BLEED, TURNED PACK 1 AND PACK 2 ON, APU OIL 2197 SMELL AND SMOKE FILLED THE CABIN AND COCKPIT. OPEN UP APU COMPARTMENT FOUND OIL DRIPPING FROM TOP OF APU GEARBOX COOLING FAN AREA.FOUND GEARBOX CHIP DETECTOR FULL OF FERROUS MATERIAL. APU ECB FAULTED APU HIGH OIL TEMP WITH AUTO SHUTDOWN. INSPECTED TAILPIPE AND TURBINE WAS DRY. SEE PHOTO ATTACHED. SEE LOG PAGE 6289098. PER CAPTAIN GRANT PROOPS THERE WAS NO ELECTRICAL SMELL.