Unit shuts down every 59 sec. No matter how much time, with or without anything in micro and I figure to replace motor and switch. How do I get to those parts in unit? Does it have to come down?

This is a problem in one of the damper-related components, either the switch or motor or the damper door may be binding.

The damper is a door inside that opens or closes depending on cooking mode. If the controller senses that the door is not in the right position, it will shut down the cook cycle.

Dacor-branded PCOR30-series microwaves are just cosmetically altered versions of the Sharp R1870-series ovens.

These Sharp-made models stop after 59 seconds when there's damper toruble.

See the attached sample drawing below for a typical damper assembly.

We have the applicable service manuals for the Sharp models and have uploaded it to our site here and here to help you in disassembling and troubleshooting your Dacor version.

You can find the Dacor PCOR parts list here and you can order Dacor parts by part number here.

If a switch is all you need, we offer a universal type for only $7.50 postpaid which you can order here.

You will have to remove the oven from the wall and remove the outer cover to access, test & replace damper parts.

Just refer to your installation instructions.

If for some reason you don't still have yours, scroll down to the bottom of this page to find yours.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.