As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BIS - THE CREW OBSERVED AFTER TAKEOFF THAT THE RIGHT PROP WOULD NOT GO BEYOND 1400 RPM. THEY ELECTED AN AIR TURN BACK FOLLOWED BY AN UNEVENTFUL LANDING. MAINTENANCE COULD NOT DUPLICATE THE PROBLEM ON THE GROUND. A TEST FLIGHT WAS REQUESTED AN WAS SUCCESSFUL. (M)