What was found
AFTER T/O, LANDING GEAR WOULD NOT RETRACT. SELECTED SYS 2 ON POSITION SELECTOR AND ATTEMPTED TO RETRACT. GEAR WOULD NOT RETRACT, NEXT PITCH TRIM 1&2 TRIPPED OFF AND WOULD NOT RESET. AUTOTHROTTLES 1&2 TRIPPED OFF AND WOULD NOT RESET. CREW DECLARED EMERG, RETURNED. ALL ELEC/HYD INDICATIONS WERE NORMAL. NO C/B`S OPEN. AFTER LANDING, ALL SWITCHES WOULD RESET. SYS ACTED LIKE A/C NEVER LEFT GROUND. CHECKED PROX BOX FOUND SN INDICATION FOR NOSE SHOCK ABSORBER. FOUND BEARING WORN ON NOSE SHOCK EXTENSION TARGET ARM. REPLACED BROKEN ROD ASSY ON CONNECTING ARM FOR NOSE GEAR PROX DETECTOR SWITCH ASSY IAW A300AMM 32-00-00. GEAR SWING OPS CHECK NORMAL.