I had a blown F7 fuze on my 31m73 (B24-P series), replaced the fuze, still got nothing, and the status light has no blinky-flashy. Judging by the diagram, I think it is the blower relay, but I am not sure how to confirm my problem. Does any know the best route to take with a dark status light, before I go and spend another large amount on a circuit card?