What was found
EWR - FLT 8081 - CREW REPORTED AFTER TAKEOFF IN CLIMB AT 3000 FEET, SMELL IN AIRCRAFT SMOKE OR FUEL, AIR RETURNED TO EWR AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SMELL DOWN TO FAULTY APU. APU PLACED ON MEL AND RETURNED TO SERVICE. FOUND APU FUEL DRAIN LINE CLOGGED.. MAINTENANCE UNCLOGGED DRAIN LINE OPERATIONALLY CHECKED APU GOOD. NO FUEL SMELL OR SMOKE NOTED. AIRCRAFT REMOVED FROM MEL AND RETURNED TO SERVICE. (M)