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To change the valve may be a little tricky, sounds like you "may" be up to it, you can decide:
You'd need to drain the fluid out of the pan, then remove the trans filter (I'd recommend having a new filter available, easy to replace, also you can either store the drained fluid ((in a clean container))and reuse it or buy new fluid, BUT it's a special MB fluid, if you decide to put new stuff in, also buy a new locking tab for the dipstick tube cap, and NOTE there is no dipstick, do a search on this topic for LOTS more info).
Then you'd remove the whole valve body, there is a part on top of the valve body called the "conductor plate", also called the "electro-hydraulic control unit". I think you could buy the whole "conductor plate"(they are prone to trouble) and the solenoids are swapped over to the new plate, so be sure to get the new solenoid installed and swap the rest of them over. Y3/6y3 is on the same side the big electrical connector is on (the side that has the 4 valves, the other side has only 2) and it's the 3rd from the front. You just remove the screw from the retainer for each pair of valves, remove the retainer itself, and pull STRAIGHT up on the individual solenoids. DON'T mix them up and DON'T forget to replace y3. OH!!! Before you can remove the screws to pull the valve body out of the tranny, you need to disconnect the electrical connector, it's on the right front corner of the transmission case, then remove the connector itself, which is retained by a screw right in the middle of the connector (on the transmission side of the connector), then the connector pulls right out of the case, I'd recommend replacing the connector also, another relatively cheap part.
Then slap it all back together and hope for the best. I am betting this solenoid is the trannys only real problem and won't need to be replaced. Be sure to read that other thread with the post in it I wrote about looking in the pan for problems, if there is alot of chips in the pan (big chips) then I'd be worried the transmission is toast. If the dealership never said the pulled the pan but they want to sell you a new tranny, I'd be worried about the diagnosis.
Gilly
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