Need help here people.
Have a Schindler 330a. 121 Block ready UNV. EXTRA info x00078. Suspect something with selector. Other problems prior to this final issue caused us to sequentially replace the CRIP board 5Q, CIO board. CPB board. Now we can not get this block error to go away. Elevator is in The pit on The springs. The selector has issue on the MOD B section. Not changing LED for any of those inputs.

Help me please!