ADCOM GTP 500 vs GTP 500 mk ll?

This takes me back years. I used to ow. A GTP500II. at the time I bought it the GTP500II just came out and the dealer still had stock of the GTP500. 

I called Adcom to ask about the differences. The only difference as I could recall was being told that there was a new supplier for the display and a few other components. Sonically, no difference. 

I owned my GTP500Ii perhaps 20 years. Never had any issues with it at all.