garage electronic control?

My garage Rollaway MkII rollup shutter door was installed by cowboys before we bought the propery. They hacked at the ends of the rafters to fit the roll shutter without additional support and the roof has sunk 2 inches in the middle. I've enquired about a wiring diagram and they won't give me one or address of the makers. The panel has a fault and they wanted £50 call out [not taken off work when done] £300 for a replacement panle and £250 for a motor. I need a wiring diargram to have the panel checked which was removed and I've lost the drawing of the wiring.
Who makes Rollaway shutter doors? or anyone can oblige with a wiring diagram please email robertwhiting76athotmail.com replace 'at' with normal email symbol as email addresses not accepted on forum in there entirety. Sorry it's so long winded.
Many thanks Bob Whiting O.A.P on state pension.