As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RH ENINGE FIRE WARNING IN FLIGHT FOLLWED BY A LH ENGINE FIRE WARNING ABOUT 5 MINUTES LATER. NO ACTUAL FIRE OBSERVED. NEITHER ENGINE WAS SHUT DOWN IN FLIGHT. INSPECTED LEFT AND RIGHT ENGINE FOR FIRE DAMAGE AND WIRING ISSUES, NONE NOTED. TROUBLESHOT AND FOUND RH LOWER FIRE DETECTOR SENSOR BAD. R/R WITH NEW. INSPECTED LH ENGINE, NO FAULTS NOTED. COMPLETED GROUND RUNS.