If the microswitch is defective, you can replace it. Searching online revealed that the switch is obsolete and no longer available from electronics supply houses.

The first photo clearly shows the part number of the switch. The second photo shows that the exterior of the switch has a schematic diagram showing how the switch operates.

Sometimes you can find an obsolete part available on eBay or other online sites.

Another possibility is to identify a compatible replacement switch. Consult the data sheet for the old part and confirm that the new part has the same specifications. I found a replacement switch on DigiKey.com for $5, with another $5 for shipping and handling.