What was found
STRONG ACRID ELECTRICAL SMOKE SMELL IN COCKPIT, BAGGAGE COMPARTMENT AND CABIN AREA, SMELL STRONG WITH APU AIR ON. AIRCRAFT POWERED ON EXTERNAL AC CART WITH ALL CABIN/GALLEY SYSTEMS ON FOR 2 HOURS. NO SMELL/SMOKE DETECTED AS PER THE CREW SMELL WAS PRESENT WITH APU ON. INSPECTED APU OIL QUANTITY LEVEL AND FOUND APU OVERSERVICED ABOUT 1.5 CANS. APU OIL QTY SYSTEM SERVICED TO THE CORRECT LEVEL IAW AMM 12-14-49 REV 44 DATED JUN 15 2016. APU RUN IAW AMM 49-00-00 REV 44 DATED JUN 15 2016, SATISFACTORY NO SMELL/SMOKE DETECTED. OIL LEVEL CHECK IAW AMM 12-14-49 REV 44 DATED JUN 15 2016, SATISFACTORY.