Newps wrote:

Yes, last year. As of the last few weeks local FSDO's
are out of the loop. All 337's go to OKC now and are
not reviewed for airworthiness.

Can you provide a citation for this, pls? It seems odd that the OP is
still having discussions with avionics shop about getting field
approvals when the procedure has changed. They obviously don't know
about it...