Some H4 Questions

Well my FB4 came in. My H3 died so it was time for a 4. A couple of questions:

My FB4 faders calibrate differently on full and other settings. How do I get to the hardware diagnostics to calibrate them. If it is in the manual I missed it.

Second: the buttons under each encoder wheel. Nothing I do makes them work. Are they working yet or do I have a problem.

Still glad I bought the FB4. Though I miss my 3. I loved the three's design.