This might be an appropriate moment to let you know that at long last the Messiah 2 PCB has been replaced and the "cut track" legacy is no more.
It took tens of thousands of original PCBs to be exhausted before bringing on the replacement (see attached picture).
To remind you, the v1.30 is compatible with all previously supported models (JAP 18000 is doubtful) plus v8 (GH-022 and BIOS 090 - tested on Asian models). 39008 and 37000 are also confirmed working.
Improvements have also been made since v1.22 to the sensitivity of Messiah 2 to any adverse voltage characteristics on the Actel chip. Without going into detail, timing is everything when considered against PS2 voltage stability and Actel voltage requirements.