My EGO LM2100SP would start then die followed by a flashing amber light. When it did run it would ramp up the rpm's regardless of the load on the motor. After much research, I found that replacing the main PCBA was the only permanent solution. Cutler's was one of the few suppliers to have this part in stock. The price was reasonable, and it shipped free & quick. Installation was quite involved as you have to disassemble the entire motor assembly to get the PCBA out. Thankfully, there are videos on the internet that show how to do it. My mower is working perfectly once again.
I originally had ordered the PCBA for the "push" version of my mower (which has different wiring). Cutler's authorized the return of the incorrect part and quickly shipped the right one. I am very happy with the service I received and would recommend them to anyone looking for EGO parts.