Hello everyone,
I have a 61c that has a perplexing problem. You can't hear your voice back to the earpiece (the description told to me was "it's like talking into a rock). It started on loops related to core 0 (4 and

but today I noticed this happening on loop 24. I've added a 8D02AE on loop 8 recently and removed this card to see if this may have caused the problem but this didn't help.