Engine removal on 300 TE 4matic.......

It would appear that I need to replace and rings and pistons on my twin turbo 300 TE 103 ,I currently have taken off the head ,hoping that was the cause of my low compression problems ie (cylinders 1-5 70 PSI and cylinder 6 approximately 150 PSI)and head has check out ok .So now I have the major task of removing the engine so can any one tell me..

1. If there is a workshop manual available that covers the 4matic.

2. And if there is a way of removing the pistons without removing the engine etc. (I know I’m clutching it straws) as you can in the 2WD version.

Thanks

Simon