As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TO SHORTLY AFTER FLAP RETRACTION, "STAB AND MACH TRIM CAUTION" MSGS APPEARED AND WOULD NOT CLEAR. DIVERTED, LDG WT 38000. INTERROGATED MDC HSTCU 270, BIT 14 SET FOR DISCONNECT SWITCH. CW FIM FAULT RESET PROCEEDURE-NO FIX. RERACKED HSTCU REF AMM 27-41-01. CW FUNCTION CHECK OF HSTCU IAW 27-41-01 AND OPS CHECK OF HSTCU IAW 27-40-00.