[Rich Biebel]

Sean, trust me here when I tell you I feel your pain but in this case I have no magic bullets for you. The modules or PC's generally are the reason for high temp shutdowns and if you changed it I would not expect it to be the problem so soon...but here are some things to try...

If the machine gets hot and won't restart....try closing the choke right at the carb while cranking it at the machines switch. These machines are very difficult to restart hot most of the time. If you choke it momentarily they starrt right back up.....Very old style bi-metal spring style electric choke with a vacuum break or pulloff.....

There is a small 2 pin connector on the solenoid at the bottom of the carbs float bowl. 12 volt supply allows fuel to pass thru the carbs main jet....That is the circuit that fails on the PC board. It is the same circuit as the fuel pump. If you can clip a meter to the solenoid leads you can look for 12 volts + and - there anytime you try to start it or with it running. If that voltage is lost it will shut right down. There is also an ATK type fuse for the fuel pump and the connector or wires might be poor....check it.

The machine MUST have a good battery connection both + and - and the + post sometimes gets loose....it is double nutted.....check it. The small white wires power the PC board......

Code 37 is not a normal fault code I see on those....36 yes.....Possibly you misread the blinks? Code 36 points to a loss of fuel......or a shutdown without a command.......Yea I know we already know that....!!!

I have a pretty large contingent of customers that have these units in mobile dog groomer vans......I have seen most everything but they throw me some curves sometimes and I just work to resolve the issues as quickly as I can.....