It's unlikely that you will find a shop that is willing to repair the box.
95% will want to just replace it with a reman box.
If your sector shaft seal is leaking, that's a problem because it requires special Chrysler tools to replace the seal without taking the box apart.
The input shaft seal isn't too bad a job on a Chrysler box, so you may find someone willing to replace it.
It's not unusual for the seals on the control valve to leak. That's a simple job that can easily be done in the car with a cheap seal kit from Edelman or Gates. Rock Auto stocks them.
Don't let anyone install a Cardone or other cheap rebuilt box in your car. They are generally garbage.
You may end up finding that your best option is to order a good quality reman box from Firm Feel, Steer and Gear, or Red Head. Then have a decent shop install it.
Most or all of the good box rebuilders may still be way behind right now, and it's likely that it could take months to get one.
Jeff