Welcome Mikeeg to irv2
Sorry to hear of your problem had a couple of Ford V-10;s and never had that problem with the Banks headers but I guess stuff happens.
Come on down and join us on the Newmar forum below helpful people there.
I'll send this post to the Ford chassis forum maybe someone there has had your problem.
When you want some Newmar KARMA just say the word meanwhile enjoy the forums and do post often.
Check out the Nor'Easters in the region forums way below lots of company from Jersey.