I've been browsing and I find nothing that would help.
Trace the wire back from the blower and see if there is power on the line (input) side of the contactor. Then check for power on the control power wire. If the problem is with the contactor, there will be voltage on both the line side and the control wire, nothing on the load (blower) side.
Some contactors have a button or a center piece that when you push it down, it closes the contacts manually. Not all contactors have this feature and if the contactor has burned out, the blower will still not work. If the control coil has burned out, the blower should come on.
From there, I'm not confident enough to tell you to try anything else.