What was found
AIR TURN BACK DUE TO PITCH TRIM ACTUATION ON PILOT SIDE WORKED UNTIL REACHING 3.0 TRIM SETTING THEN STOPPED FUNCTIONING DURING TAKEOFF. PITCH TRIM WAS SET TO 5.3. CREW TRIED TO MOVE TWO TIMES WITH THE PILOT’S CONTROL TO NO AVAIL, THEN ACTIVATED CO-PILOT CONTROL AND MOVED THE TRIM SETTING TO UNDER 3.0. UNDER 3.0, THE PILOT TRIM WORKED NORMAL IN BOTH UP AND DOWN MOVEMENT. AIRCRAFT LANDED WITHOUT INCIDENT AT KTEB. FOUND RELAY MOUNT BRACKET NOT PROPERLY GROUNDED TO AIRCRAFT STRUCTURE. RE-BONDED TO AIRCRAFT STRUCTURE AND REPLACED RELAY K211. RE-RACKED JB3 AND VERIFIED PIN CONDITION AND RETENTION. WORK PERFORMED IAW WM 27-12-07 AND AMM 24-63-09. OPS CHECK GOOD AT THIS TIME.