As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB CH 1 & 2 AND MACH TRIM FAILED SHORTLY AFTER TAKEOFF. RAN QRH, RESET AND IT FAILED AGAIN. WAS ABLE TO GET ALL TO WORK WHILE FLYING TO BURN OFF GAS. RETURNED TO BOI. REMOVED AND REPLACED MOTOR CONTROL UNIT IAW 27-42-05. REMOVED AND REPLACED HSTA IAW 27-42-01. OPS CHECK GOOD.