Thanks for the answers.
The module that failed is an older gray colored unit.
Client had advised that those three station on that module were working intermittently prior to my expanding the system.
Initially I thought it was due to a field wiring problem yet yesterday I was up-dating a really bad wiring job leading to the controller - that's how I found the problem.
I agree about some manufacturers having bad runs on components, I have certainly experienced valve problems - however not enough to switch brands.
Nice Try = You Suck Spelled Differently