As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(MIA) - WHEN SETTING POWER ABOVE 70 PERCENT NR 4 ENGINE N1 WENT OFF SCALE LOW. ABORTED BELOW 60 KTS AND WHEN PULLED BACK NR 4 N1 CAMBE BACK. DID NOT ACCOMPLISH HIGH ENERGY STOP. REMOVED AND REPLACED NR 4 ENGINE N1 TACH TRANSMITTER. OPERATIONAL CHECK SATISFACTORY IAW MM 77-12-01, AIRCRAFT RETURN TO SERVICE.