Ambika cards 3/6 not working

Curious if experienced builders would make suggestions for troubleshooting this problem. Basically I have Ambika working well except for cards 3 and 6. What’s a good method for tracking the error? Things to test on motherboard?

Fairly new to diy… Just looking for suggestions on how you might trace this problem out.

What’s the issue? Are they receiving power? What about the status LEDs? Is there something wrong or glitchy in how they sound?