This article covers SP2.2 models sold in 2014-2015, with instructions for swapping the Printed Circuit Board "PCB" aka Motherboard. In Summary you have to access the electrical compartment, typically on the Right side panel when looking at the gauges, then removing the PCB from the 7 nylon standoffs and 5 screws.
Here is a view behind the PCB showing the 7 white nylon standoffs to detach, plus the 5 heat-sink screws to remove.
The attached PDF describes the procedure for replacing a SunPump 2.2 controller board with pictures. Download and print.