As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FKL/PIT - FLT 5952 - CREW NOTICED A NOXIOUS SMELL DURING FLIGHT. MAINTENANCE TROUBLESHOT AND FOUND A CHAFED WIRE IN THE FIRE PULL HANDLE. REMOVED AND REPLACED THE FIRE PULL HANDLE, AND THE AIRCRAFT WAS RETURNED TO SERVICE. HOWEVER, THIS PROBLEM RECURRED LATER IN THE DAY. SEE MRR CONTROL NR MASA99089. (X)