Evening all,
im happy to say my IBMU is up and running!!!
first thing i did was test the 15v on the test pins and was getting around 2v ish, after reading about C26, C14 22uF 16V (Output of +15V & -15V module) i suspected these may be at fault. now ive replaced them and everything seems to be working.
good luck with yours bob but i suspect it could be the same two capacitors that need changing