What was found
(CAN) AT C-CHECK. WHILE PERFORMING FWD MLG TRUNION FITTING REPLACEMENT ON THE RT MLG. TECH NOTICED NO SHIMS WERE INSTALLED BETWEEN FWD TRUNNION BEARING AND TRUNNION LINK TO OBTAIN REQUIRED 0.00 TO 0.003 INCH CLEARANCE. NO MEARSURMENT WAS TAKEN DUE TO FWD TRUNNION REPLACEMENT REQUIRES SHIM CLEARANCE BE RESET. AFTER TRUNNION LINK REMOVAL, SHOCK STRUT SHIFTED FORWARD AT THE AFT BEARING. WHILE TRYING TO REPOSITION THE SHOCK STRUT, SHOCK STRUT DISENGAGED FROM THE AFT BEARING ALLOWING THE SHOCK STRUT TO FALL FORWARD AND FREE FALL FROM AIRCRAFT. UPON EXAMINATION, AFT TRUNNION FUSE BOLT SHANK WAS FOUND CRACKED THRU AT BOLT HEAD AREA, TRUNNION BEARING UNI-BALL FOUND CRACKED, AND SHOCK STRUT AFT TRUNNION CRACKED.