I don't know but all I can tell you is that they replaced the main board and processor. The lamp isn't new because it isn't bright enough to be new. It seems to me that it is the same lamp that was in it when I sent it in for repair. At least it seems very similar in performance. I had 1500 hours on the lamp. When I received the repaired unit back the lamp said 1 hour. I have since watched a couple of hours.There are tools that are supposed to be used to move the data between boards. This is important because there is panel specific config in the EEPROM / flash.
Going way back as far as the X3 there is a process in the service manual called "4.4.1 LAMP TIME and COLOR TEMPERATURE DATA BACKUP"
I asked Mike Garrett about the lamp and he said that he doubted JVC put a new lamp in it and I believe him as it performs like my old lamp of 1500 hours.
Hopefully whatever was in the EEPROM flash is not important enough to effect anything as the projector seems to be performing fine.
I sure as hell don't want to send it in again for an EEPROM flash. It took two months of waiting as it was.
I will run autocal gamma on the projector tonight and see how the 2.2 gamma log looks. I had a little gamma droop that I corrected the last time I ran autocal. If the new main board and processor were replaced I would assume the autocal I ran in the past would be gone and the droop would be back. If it tracks 2.2 perfectly then JVC must have reloaded the previous parameters but apparently forgot to set the timer back on the bulb.