Let me throw this at you plainly as i'm surely no trannie expert.
To VOLVOBOY: People misuse the term "flush". A drain & fill is called a flush by many. If the mechanic performed a "flush" that doesn't mean he unhooked a cooling line and pumped out old whilst pouring in new as you or I might do.
Even if he performed a pump-out there's no mentioning of how many litres of fluid were used. So, either way, drain & fill or a measly "6-8l pump-out" there could EASILY be dirt left behind which, in a weeks time, could show up.
Whether the fellow used the correct fluid or not is the bigger question.
To Cleverkiwi: The bores of the valve body are made of aluminum and scratch. They can catch dirt and hang up their piston elements, I'm told.
If you can assure yourself the fluid is correct and fairly clean, I'd urge you to try the LubeGard (red) I mentioned above. It ain't snake oil. It's a lube which worked for me and does so for many on the oil board.
If you're at the point of R&Ring your valve body then you have nothing to lose by trying the stuff beyond its purchase price.
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