Acura alarm start interupt starting issues?

Hi:

I have an intermittent start issue with my '90 LS. When the car is hot (from driving or sitting in the sun) it won’t crank. After it sits for a while and cools down, it starts right up.

I’ve narrowed things down to the likely problem being the dealer installed (at time of original purchase) Acura car alarm (start interupt function).

Does anyone know if it’s still possible to get parts for these alarm systems?

Thanks.