Sure, there are Youtube videos on how to rebuild a linear solenoid in this transmission...so what? That's not a diagnosis...that's someone selling you a product and showing you how to install it.
Replacing the linear solenoids (which are not really a common failure point) will not fix a bad valve body...often, the solenoid bore itself is worn and new solenoids are just as ineffective at managing the line pressure as the old ones due to the worn bore. The only fix for a worn bore is to drill out the bore and sleeve it. Tools and parts for that job (assuming that you're up for it) are about $300...add in the cost of rebuilding/replacing any worn solenoids, and it would have been cheaper to send the body out for a rebuild...
Sending the body out for a rebuild is what I've recommended to all those considering a solenoid swap/rebuild.
$450 is a reasonable price for the job...I paid $495 from Valve Body Builders in Ontario...as I wrote in my notes on replacing the valve body...
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