As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 4633 - WHILE PULLING INTO POSITION FOR TAKEOFF, THE CREW NOTICED THE RIGHT PROP RPM WAS BETWEEN 1150 AND 1200 AT GROUND IDLE AND 1080 AT FLIGHT IDLE. AIRCRAFT RETURNED TO THE GATE AND MAINTENANCE RIGGED THE RIGHT PCU. GROUND RAN GOOD. AIRCRAFT RETURNED TO SERVICE. (M)