As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB-OUT FROM SLC THRU 23000, AIRCRAFT BEGAN VERTICLE OSCILLATIONS MORE THAN USUAL. AUTOPILOT WAS DISCONNECTED AND ELEV FEEL WAS STIFF. NO COCKPIT INDICATIONS TO IND ELEV IN MANUAL CONTROL. AIRCRAFT FLOWN MANUALLY TO LAS. T/S PER TSM ACS FAULT MOSV1 PRM REMOVED AND REPLACED ELEV POWER MOTOR SHUT OFF VALVE PER AMM.