As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6473 - JFK-IAD - DURING TAKEOFF, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LEFT ENGINE WOULD ONLY PRODUCE 98.5 PERCENT RPM. MAINTENANCE INSPECTED AND ADJUSTED X SCREW, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)