What was found
(CAN) ACFT TOOK OF AND WHEN LANDING GEAR SELECTOR "UP" - IN TRANSIT LIGHTS WOULD COME ON - NO OTHERS......CB LANDING GEAR CONTROL WAS ALSO POPPED AND WOULD NOT RESET. AIRCRAFT RETURNED TO BLOCKS AND MAINTENANCE FOUND CHAFED WIRE UNDER HYD POWER PACK IN LH WHEEL WELL - WIRE REPAIRED AND AIRCRAFT RETURNED TO SERVICE AFTER GEAR SWINGS CARRIED OUT.