As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL "MACH TRIM FAIL" RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. DURING TROUBLESHOOTING FOUND C/B C4 AFCS SYSTEM A MACH TRIM AC AT P18.1 POPPED RESET C/B IAW AMM 20-60-01 PERFORMED MACH TRIM LIBRARY TEST 60.33 IAW 22-11-00 SYSTEM TEST PASS SEAMC NOTIFIED.