But it may be that whatever screwed up the bed temperature measurement on your board screwed up other things as well, in which case you probably have to go with a Ramps or other board. I just don't want you to waste money ordering hardware until you're sure the only thing wrong with the factory board in the bed temperature input and everything else works fine.

I suspect someone with good knowledge of the board could help you test and repair it, but what I did was to recompile the firmware after editing the configuration file to indicate that there was no bed heater on the printer. Getting the firmware reflashed was a real ordeal. I tried lots of different ways and finally what worked was the procedure Solidoodle posted on their site. The instructions were not perfectly clear, but whatever I did finally worked, although I doubt if I could do it again. I also discovered that you have to be careful to use the firmware that was in use when my Press was manufactured. I have one of the early Press printers. Modifying the updated firmware, which is the only one Solidoodle had on their site at the time, screwed up the leveling procedure making it impossible to print, so I went through the whole thing again with the original firmware which was an additional pain to find.

I then bought a 24 volt temperature controller and a 24 volt power supply. Since my factory bed heater is still OK, I can use it, but have to control the bed temperature independently of the printer - not a big deal.

If I had been thinking ahead I would have written down all the steps in detail, but didn't.  Sorry I can't give you all the steps I went though, but this may help give somewhat of an overview of the situation.