I received an email from Axiom today:

After discussion with Axiom's engineer it was recommended to replace the woofer. I already put an order for a new woofer to be sent to you. Please, keep me posted once you will have replaced it.

I'm crossing my fingers and hoping that the woofer is the problem.
Has the woofer changed from v2 to v3?

Thanks,
Zak

Panasonic TC-P65V10 65" Plasma
Sony KDL-55XBR8 55" LED LCD
Yamaha RX-V3800
Axiom Epic 60 - 500 (7.1)