They were actually saying C deck 3, C deck 4, and C deck 12. With Mesa starting VHF soon, they can no longer just say "channel 3" anymore. I'm still unsure what they'll refer to their VHF channels as (and neither do their dispatchers)
Any TG for C12? AJ was dispatched for an injured person on the Peralta Trail, initially it was on C4 then moved to C12. Tried searching the Simulcast system but never heard anything and there is no listing for C12 on the database.