Fixed.

I didn't recall that I had initially locked down the VIN (preventing it being changed). That's what happens when you try to complete something that you started years prior.

The VIN should normally be at the primary location. Sometimes it may be at the alternate location.

Just make certain not to make any changes, if the original displayed parameter is not in proper VIN form. Do NOT change the leading cell designated as "NULL".

Changing the non-VIN area would likely result in a bricked PCM.