What was found
(CAN) WHILE IN DESCENT FROM FL330, AND DESCENDING THROUGH 15,000 FT CABIN ALTITUDE STARTED TO INCREASE RAPIDLY. AIRCRAFT DIVERTED TO CYQM FOR MAINTENANCE. WHILE AT 10,000 FT CABIN ALTITUDE RECOVERED. WHEN THROTTLES REDUCED FROM 88 TO 70 PERCENT N1, CABIN PRESSURIZATION WAS LOST AGAIN. MAINTENANCE DETERMINED THAT THE L/H SQUAT SWITCH WAS AT FAULT UNIT REPLACED, NO FURTHER ACTION.