What was found
ON PUSHBACK, AFTER NORMAL START, THE NR 1 ENGINE REMAINED IN FEATHER FOR 3-5 MINUTES WITH CODITION LEVER AT MAX. NO HISTORY. INTERROGATED CDS WITH NO FAULTS FOUND. COMPLIED WITH FIM 61-20-00-810-804. PERFORMED FUNCTIONAL TEST OF THE NR 1 PROPELLER TO UNFEATHER IAW AMM TASK 61-20-00-720-801. NR 1 PROP UNFEATHERED EACH TIME WITHIN 30 SECONDS. NO FAULTS IN CDS. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.