I agree with Mick, one suggestion I would send your old EHC to Curtis for a second opinion, he can bench test it for faults. I ordered one from him for my Bulldog Bagger, works great.
I like them so much I bought one for my bulldog and then took off a perfectly good RIP from my K9 and replaced it with one also
I am however a little OCD
Curtis is the owner of Wildsteed Worx and he is a really great guy to know when it comes to Big Dogs