Hello to all that read this I hope the New Year is treating you well.

I have an 05 SRT-6 with 33,000 miles on it. The car has developed the stuc in gear symptom(limp mode) it has 2 fault codes stored p0715 and p0738.
Ive researched what I can on this site and believe I have an issue with my "Electric plate" I believe its called. the dealer is trying to charge me $1750.00 for parts and labor saying they have to remove transmission valve body to access the speed sensor in the transmission. they say its $900 in parts alone.

Is anyone aware of a good independant shop I can repair my car at in the Orange Co CA area?

Any help provided will be much appreciated