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Here's the link Bruce: http://www.actiontireco.com/Scripts/default.asp
Ask for Rick Stewart, he's the owner and mention my name.
There are some issues with the 400 and the best place to find them is here: http://autos.dir.groups.yahoo.com/gr...-Coach-Owners/
Al might jump in here as well, he may know some of the problems.
Not much help on the 400 as my Affinity had the C-12 @455hp. In 10 years with the C12 replaced 2 sensors (cam and crankshaft sensors due to micro engine shut down at cruise speed) belt tensioner, 2 belts, coolant and a T-stat (stuck open).
I will jump on this site and see if I can learn anything. Have only driven the coach a few 100 miles so far, no issues at all, not used to having everything work. Once we get to Holland MH. we plan on changing all fluids, everything, rear end, transmission, coolant, check the engine out, get some spares onboard etc. before we head out west. There is enough power, but not overwhelming amounts, the Silverleaf works well.