Recently, I visited the mazda service centre at Jalan 222 just find out what they have got to offer and to my surprise they actually service RX7s. While I was there, had a brief chat with the general manager and he said they were willing to stock parts for RX7 if there is sufficient demand. Currently, OEM parts would require 3 months of lead time from Japan.
As my aircon is showing signs of failure..I might just send the car in to get it to get it checked out.