What was found
WHILE IN CRUISE FLIGHT, RETURNING FROM SIGHTSEEING TOUR, PILOT NOTICED THE N2/NR LOWER THAN NORMAL. THE PILOT MADE SEVERAL COLLECTIVE ADJUSTMENTS IN AN ATTEMPT TO BRING THE RPM UP, WHICH RESULTED IN A FURTHER DECAY OF THE RPM TO 94 PERCENT. AFTER RADIO CONSULTATION WITH MX STAFF, IT WAS DECIDED TO CONTINUE FLIGHT WITH RPM AT 94 PERCENT AND TORQUE AT 60-70 PERCENT AND PROCEED TO AIRPORT WHERE THE ATC WAS ADVISED OF PROBLEM. AN UNEVENTFUL LANDING WAS MADE.