No service manual available but I can give you some advice on how to do it the 6 screws need to come out t20 then the earth wire behind and the wires need to be removed I’ve attached pic of 1st step,try and follow the steps in pics I’ve circled and arrowed most screws that need to be removed when you remove all the electrical components there is a metal bar that needs to be removed you use a pliers and pull it to the left to release it and then back to right to remove it then you should be able to access the fan which is held on with 4 screws. Hope this is some help to you kai.