Cruise Control 85 300TD

[NoSparkNeeded]

My cruise control failed today. It had been working fine. I can do without it, however I'm really weird. I just cannot have things that
don't work. I really only use it about 3x per year. Anyway, it still
sort of works. I cannot accel or decel with the stalk, but if I "resume"
with the stalk it will actuate back to where it was set at some point.
Do you suppose it's the stalk switches or the CC amp? I searched
and read about the amp resolder. I can certainly do that. Would
that be the first place to start diagnosing? I really don't want to do the
Audiovox fix. I'm very skilled at soldering electronic circuits so I guess
I'll just pull it and try in the morning. If that doesn't work what would be the logical next step?