Why don't you just subscribe to alldatadiy.com? $14.99 a year gets you access to the online service manual.

You can also buy a copy of Workshop Information System (WIS) for $25 off of ebay.

Also, the Mercedes-Benz Electronic Parts Catalog (EPC)is now free for US models. All you have to do is sign-up and get a user ID.

https://epc.startekinfo.com/epc/welcome.jsp

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles