I successfully repaired several 4Z226E circuit boards.    These boards are 240VAC input and 180VDC out and are used to power 1.5 HP  DC motors.     I repaired them by replacing all the transistors with new ones and the small transformer.
Most of the parts to repair are on hand.  For repair contact me at jglass52@hotmail.com

Jim Glass
Genoa IL
www.OutbackMachineShop.com