What was found
GPU NOTICED SMOKE COMING FROM DC EXTERNAL POWER RECEPTACLE WHEN GPU POWER CORD WAS REMOVED. FOUND GROUND WIRE TERMINAL END TO DC INTERNAL POWER RECEPTACLE ATTACHING HARDWARE LOOSE AT STUD CAUSING ARCING. INSPECTED CURRENT LIMITERS AND ASSOCIATED WIRING FOR DEFECTS. NO DEFECTS NOTED. R & R DC EXTERNAL POWER RECEPTACLE AND RECEPTACLE GROUND WIRE IAW AMM TASK 24-42-01-000-801 + 24-42-01-400-801. ALSO REF WM 24-42-00 PG 1, SHEET 1 OF 1. C/W OPS TEST OF THE EXTERNAL DC POWER SYS IAW TASK 24-42-00-710-801. OPS TEST GOOD. RETURNED TO SERVICE.