Dynacord powermate 1000

[Raycrom]

Hi Members I am new to this forum. I need help with a powermate 1000, I think its a mk1. It's destroying output transistors MJ15023 and MJ15022. The board number is 84169h. I've checked all the drivers/res caps/relays. Then only fault I did find was there is a small 10 ohm safety resistor that connects 0volts to chassis. I'm hoping someone out there has come across this fault. Thanks for your time in reading this post.