Interesting....
This place advertises that they can unlock a PCM that has been locked by a tuner. ->
http://www.pcmcalibrators.net/
Might be worth keeping them in mind.
They also advertise that they can unbrick a PCM too. Wish I had known about them earlier when three PCMs mysteriously died in my car while at South Georgia Corvette. Cost me $200 a pop.
