What was found
SPARKS VISIBLE AFT OF PROPELLER HUB ON NR 1 ENGINE. AFTER LANDING WITH PROPELLER DEICE ON. PERFORMED GVI OF NR 1 PROP AND DE-ICE LEADS. NO DEFECTS FOUND. PERFORMED FUNCTIONAL TEST OF PROPELLERS DE-ICING SYS IAW AMM TASK 30-61-00-720-801. TESTS GOOD. WHILE PERFORMING TEST NO ABNORMAL SIGNS ON THE NR 1 PROPELLER OR ENGINE. NO FURTHER DEFECTS. OFF GOING PILOT ADVISED NO PROP FAULTS OR CAUTION MESSAGES. COULD NOT DUPLICATE. RETURNED TO SERVICE.