Originally Posted by sgbfly
Tom & Airmob,
Thanks for your thoughts. I am going to wait for the vendors reply first & I will post their reply here (tomorrow hopefully). I am inclined to have a go myself but it's sensible to hear their reply first.
Tom your suggestions are well described and logical. Many thanks.
I probably went into more detail than needed, but thought others may have a similar question later, so took the opportunity to spell out a process to zero in on the cause and possible soultions. I linked the thread in my FAQ Post#3 for future reference.