Service Manual for Technics SX-U90

I am seeking out a service manual for a Technics U90 series organ. I had a power supply problem and got a tech to have a llok at it & he removed the whole power supply unit. and never brought it back despite several attempts to contact him. I have since found out that he has lost the power supply when he moved house.I have found another more reliable tech who is willing to have a look at it & try & get the necessary parts. I tracked one down in England but he wanted too much for it. I only need a decent photo copy. If anyone can help I will be very pleased.