What was found
(CAN) PILOT REPORTED AIR GROUND WARNING AFTER TAKEOFF. PILOT RESET CIRCUIT BREAKERS AND EVERYTHING RETURNED TO NORMAL. UPON RETURN TO MAIN BASE, MAINTENANCE NOTICED PORT WEIGHT ON WHEEL TARGET SHAFT BOLT SHEARED. BOLT WAS REPLACED AND AIRCRAFT PUT ON JACKS AND CHECKED SERVICEABLE. SUBMITTER STATES THIS IS THE SECOND TIME THEY HAVE A FAILURE OF THIS BOLT. BOLTS SENT TO MANUFACTURER FOR INVESTIGATION.