As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1828 - MKE-CMH - DURING CLIMB-OUT, THE CREW NOTICED THE LEFT PROPELLER GAUGE FLUCTUATING BETWEEN 1400-2000 RPM. NOTIFIED ATC AND DISPATCH RETURNING TO MKE. AFTER MAKING AN UNEVENTFUL LANDING, MAINTENANCE TROUBLESHOT THE PROBLEM AND FOUND A BROKEN WIRE AT THE LT TACH GENERATOR AND REPLACED THE RT TACH GENERATOR. AFTER OPERATIONLLY CHECKING GOOD, THE AIRCRAFT WAS RETURNED TO SERVICE. (M)