I attended a call-back for Marc in the Okotoks area, upon inspection of the furnace I noticed the gas valve was left in the “off” position from previous planned maintenance. Tested furnace and cycled several times, everything functions great. I did notice the gasket to the collector box directly behind the inducer motor is beginning to wear down and leak condensate. Customer was in a hurry the leave the house as he is preparing for vacation but will be considering it when he returns.