As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MACH TRIM STAB TRIM CASS MESSAGES IN FLT. C/W QRH, MESSAGES REMAINED. OCCURRED DURING CRUISE AFTER NORMAL TAKE OFF. C/W QRH AND SET FLAPS TO 20. CONTROLS DIFFICULT TO MOVE BUT FELT SAFE TO PROCEED. LANDED WITHOUT ISSUES, SMOOTH LANDING BUT DID DECLARE AN EMERGENCY AS PRECAUTION BEFORE LANDING. AIRCRAFT REMOVED FROM SERVICE. R&R PITCH DISCONNECT SWITCH IAW AWAC SUP 10-048C OPS CHECKS GOOD.