What was found
(CAN) A/C DEPARTED WITH 10KT WINDS AND BLOWING SNOW. A/C MADE ROUTINE TAKE OFF AND FLIGHT. AFTER LANDING, DURING TAXI ON RUNWAY, PILOT NOTICED A/C WAS PULLING TO ONE SIDE. PILOT TAXIED OFF RUNWAY AND PARKED. HE THEN VISUALLY INSPECTED LT MAIN TIRE AND SAW IT WAS FLAT. MAINT WAS DISPATCHED. MAINT REPLACED MAIN WHEEL AND INSTALLED NEW TUBE IN NOSE WHEEL. UPON INSP MAIN ASSY HAD A SHEARED VALVE STEM AND NOSE TUBE HAD A PIN HOLE IN IT. CAUSE OF SHEARED VALVE STEM IS BELIEVED TO HAVE BEEN FROZEN BRAKES. CAUSE OF PIN HOLE IN THE NOSE TUBE IS BELIEVED TO HAVE BEEN THE CHANGE IN TEMPERATURE BETWEEN AREA OF DEPARTURE AND AREA OF ARRIVAL CAUSING WHEEL PRESSURE TO HAVE GONE DOWN AND TUBE GETTING PINCHED.