As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE HAND FLYING AC WITH AUTOPILOT OFF THE AC EXPERIENCED AN UNCOMMANDED PITCH UP OF 5 TO 7 DEGREES. AFTER CORRECTION AND RETRIM THE AC THEN EXPERIENCED AN UNCOMMANDED PITCH DOWN. REPLACED LT ELEVATOR TRIM TAB IB PUSH ROD AND ADJUSTED RT ELEVATOR TRIM TAB IB AND OB PUSH ROD ENDS. OPS CHECK GOOD. AC RETURNED TO SERVICE. (K)