As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 4007 - PIT-CHO - CREW NOTICED A FLUCTUATION IN RT ENGINE NH INDICATOR. ELECTED TO RETURN TO PIT. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. PIT MAINTENANCE INSPECTED AIRCRAFT AND DISCOVERED A DEFECTIVE NH TRANSMITTER. REPLACED TRANSMITTER IAW MM 71-00-00. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.