Although I thought I was done this project, and the RAM had passed multiple test cycles in Advanced Amiga Analyzer, I got a couple of strange Gurus. I then noticed that they occurred when I was opening a program or writing to the RAM disk.
do you know what testing mythology the ram checker used? my guess is its not very good

like for example, if you just write a random number to every byte and read it back, that not a very good method as it does not test every bit.