Maintenance for Black Taxi - Carbodies Fairway Driver Plus?

I Drive a black Cab - An N Reg Carbodies Fairway Driver Plus, with the 2.7 nissan engine.
Does anyone know where I can get a maintenance manual - Haynes don’t seem to do one.
I need to have a look at the electrics - the indicators stopped working, and it was no the fuse, so I took it to the garage, who said it was a corroded lamp and replaced it (but would this knock out all four lamps?) - they got the indicators working again, but now the wipers have stopped working, I thought it was the fuse however changing it didn’t fix it - and then they started working again, then stopped a day later! I think it may be a loose connection in the fuse box, but I don’t want to take it off and have a look without some sort of guide ( I have no real electronic experience past GSCE technology) - I cant really afford to take it to the garage again so soon, but i cant drive without wipers!! Help!

Answers:
I would be more inclined to think that water is finding it's way into the wiper motor or connections, also check the actual switch, the contacts inside could be wearing down and only making occasional contact. I would have a scout round ebay or even an autojumble to locate a manual, or even you could chance your arm and see if theres a garage with a spare or old copy of a manual they could sell you (Or if you're really lucky give you for nothing!) The only problem with the wiper mechanism is I would imagine it's buried behind the dashboard on the old FX4 type taxi.
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