As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6250 - ABE-IAD - DURING TAKEOFF, MADE AN UNSCHEDULED LANDING AT ABE DUE TO LEFT ENGINE NOT MAKING TARGET TORQUE. AIRCRAFT RETURNED AND LANDED AT ABE WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED TTL VALVE, OPS CHECKS OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)