Ikpa,

This sounds similar to what I've been dealing with on my '97 C230 with the same transmission, but only 88,200 miles on it. See my thread here: http://www.peachparts.com/shopforum/showthread.php?t=185207&highlight=722.6

At present, my car is behaving just fine without a $1500 controller repair . . . but even if that turned out to be your problem, it's better than $6200. How often does the problem recur?

Find an independent mechanic who is qualified to rebuild these transmissions -- the Good Shops forum may have some listed for Sacramento. Good luck!

__________________
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-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
Formerly:
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino