As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED MACH TRIM FAULT LIGHT AND WARNING TONE ABOVE .74 MACH. REPLACED HORIZONTAL STABLIZER POSITION SENSOR PER LEARJET A.M.M. PROBLEM RECURRED WITH ADDITION OF RAPID NOSE UP OR DOWN TRIM CHANGE ABOVE .69 MACH. AFTER MUCH TROUBLESHOOTING, FOUND NEW SENSOR WIRED 180 DEGREES OUT OF PHASE. ANOTHER SENSOR CORRECTED THE PROBLEM.