What was found
AIR TURN BACK: ON FLIGHT 8202, CREW OBSERVED NR2 NP DID NOT RESPOND TO POWER LEVER ADJUSTMENT AND DID NOT HOLD 100 PERCENT NP ON APPROACH WITH POWER LEVER ANGLE BELOW 60 DEGREES. CREW ELECTED TO RETURN TO DEPARTURE FOR MX PURPOSES. AFTER TROUBLESHOOTING, MX RE-RIGGED HMU AND PCU. OPS CHECK GOOD AND ACFT RETURNED TO SERVICE.