The relay that supplies power to my Sani-Con has been giving me grief for a while. I have not been very proactive in replacing it, but it recently bit the dirt, so I had necessary motivation to find a replacement.
The relay sits behind the front panel of the wet bay, and it looks like it sits in there upside down. With that orientation, it gathers water and corrodes the inside contacts. I fixed mine several times, but it finally died.
I found a standard 87A 12V relay at Napa to be a worthy replacement. Same configuration, and a bit better built than the OEM version. I also tied it up with cable ties so that it sat correctly behind the panel so that water would run off of it.
The part number on the box from Napa is AR272 (and also V07172 in smaller print). You can find them online for around $5-8, and Napa sells them for around $15. I wrote about my adventures of figuring out how a relay works and replacing the goofed up one - here