Sorry to bring up an old thread but I have exactly the same problem in my tf80-sc box on the xc90. Started with a bit of flaring as they call it and now nothing. Nothing forwards or reverse. Anyone know what the slu solenoid is ? Im struggling to find much on Google

Hi guys. new d5 s60 volvo owner and want to flush my 6 speed tf80sc box. However i can see two hex bolts which could potentially be fill plugs. i dont want to get it wrong and goose my gearbox so wondered if anyone could tell me if its the plug ringed in red on the left or the right of the picture ...