What was found
ON TAKEOFF ROLL, LEFT ENGINE TQ FLUCTUATED BETWEEN 90, 100 & 80 PERCENT WHILE THE RIGHT ENGINE TQ WAS AT 90 PERCENT. A ( + -) 10 PERCENT TQ DIFFERENCE ON LEFT ENGINE WAS OBSERVED. TAKEOFF ABORTED. RAN LEFT & RIGHT ENGINES IN TAKEOFF POSITION WHILE EEC ARE ON, PROP SYNC -ON-, AUTOFEATHER -ON-. RAN ENGINES IN VARIOUS ARRANGEMENTS. OPS CHECKS GOOD. NO DEFECTS NOTED. RETRIMMED BOTH ENGINES. OPS CHECKS GOOD. 09/16 - UPDATE: FURTHER TROUBLESHOOTING RESULTED IN REMOVAL AND REPLACEMENT OF NR 1 HMU. OPS AND LEAKS CHECKS GOOD.