What issues are you having with the PCB?
Is it FUBAR? Or is it missing?
The MAC500 has ben discontinued for some time now but some of us have new or refurbished cards available. A new card could go for upwards of $1200 Martin has a flat rate for PCB repairs. For the MAC500 I believe it near $300 -$325
As for the igniter, call your local Martin authorized repair center.
Our PCB is unfortunately unrepeatable, I don't know the details as to why, all I know was it was sent in to be repaired and that was the response. With only two parts missing\broken I figured I could replace them if it was with in a budget I was given or else it would just continue to rot. That budget I was given was $700 max. So it appears that it will just be used for parts as I need them.