What was found
AUTOFEATHER TEST FAILED FOR NR 1 AND 2 ENGINES. NR 1 AUTOFEATHER SAYS ABORT. NR 2 AUTOFEATHER SAYS FAILED. THREE ATTEMPTS AT TEST. THIRD ATTEMPT WAS AFTER COMPLETE ELECTRONIC SHUTDOWN AND RESTART. REMOVED FROM SERVICE. INTERROGATED CDS AND FOUND FAULT CODES FOR NR 1 ENGINE 72A & 771A AS WELL AS NR 2 ENGINE 292A. CLEARED FAULT CODES IN CDS AND THEN RAN OPS TEST IAW AMM 61-20-00-710-801 WITHOUT AND WITH ENGINE RUNS. OPS CHECKED GOOD BOTH TIMES & NO NEW FAULT CODES APPEARED. NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.