DEC 871 / 874 power controller engineering drawings?

[Mattis Lind]

Is there engineering drawings online for the DEC 871 or 874 power
controllers?

I have one with a failed solid state relay and I cannot figure out the spec.

One is an Opto-Film OFA-2402H and the other is a CLARE  203A05A3A

But I cannot find a data sheet for any of those. Does anyone know a
compatible replacement device? The pinout is not something I can find
amongst the ones at Mouser.

/Mattis