Originally Posted by
eagle670
Found the RCM on the Mercedes Parts Superstore website for $169.45
Part#1705450305, Dealer was $226.20
You'll get the same results from D.J. for around $20. Board/Relays are tested and modded and there are many satisfied members. Paying all that money for a new board is just buying the same problem down the road. I.E.- you'll still have to do the re-solder on the new board eventually. 
Had the exact same symptoms happen to my board @ 30,000 mi. Did my own soldering and she's been perfect for nearly 70,000 more miles.
If you must have a new RCM, RockAuto is cheaper...STANDARD MOTOR PRODUCTS Part # RY1739 @ $127.79
http://www.rockauto.com/catalog/rafr...&parttype=3188