You need a better shop to work with. Like Tech 7 posted the flashing light means there is a code being set. I will second that you do not pull the cab on the 7000 series. You roll the entire transmission/rear end out the back to work on it transmission. The valves and harness can be service form the bottom.
I would NOT just replace the valves. They rarely go bad. I have had much more trouble with the harness and connections rather than the valve themselves.
So diagnose then repair!!! You can read the codes on a JD 7800 without any computer. You move the spare fuse to an empty DIA hole and then you used the turn signal lever to check the codes.
Here is a link to a post on YT where Tech 7 walks a fellow through the steps.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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