As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 1672 - CREW COULD NOT ADVANCE THROTTLES PAST 34 UNITS DURING CLIMB. FLIGHT RETURNED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE FOUND THE NR 1 THROTTLE FEEDBACK CABLES FROZEN AND BROKEN. CABLES WERE REPLACED. REFERENCE USAAF96057.