95 518 is no longer shifting into OD. Lock-up still works.
I have it wired with power to center pin and 2 separate toggle switches to ground for OD and LU.
When I hit toggle for OD, nothing happens, toggle for LU does work and RPMs drop 5%.

So is this most likely the solenoid?
What else can I do to troubleshoot to pin down the issue?
Are there 2 separate solenoid for OD & LU?

What's involved if it needs replaced?

Thx