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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