What was found
FLIGHT 3385 RDU-LGA - UPON DESCENT THE CREW SMELLED AN ELECTRICAL BURNING SMELL COMING FROM THE LEFT HAND SIDE OF THE COCKPIT. NO VISIBLE SMOKE WAS NOTED. DURING PREVIOUS ENGINE START IN RDU, THE GPU OVERRATED AND WENT OFF LINE DURING START. MAINTENANCE INSPECTED GPU RECEPTACLE AND BATTERY COMPARTMENT FOR EVIDENCE OF BURNING. POWERED AIRCRAFT WITH GPU. NO DEFECTS WERE NOTED. NO EVIDENCE OF SMOKE OR BURNING SMELL WAS DETECTED.