I got this so far:
Random Value : FAILURE: 0x39bd9ac36fcf7d51 != 0x39bd9a436fcf7d51 at offset 0x2e1ebca0.
FAILURE: 0x2ddb7380fcff96f2 != 0x2ddb7388fcff96f2 at offset 0x2c8fc50d8.
UPDATE
When I added the second set of DIMMS back in October, I did turn on XMP, which I've never done while I was in Debian for 2 years. So I removed all the ram and I tested each module, one by one at the base speed of 2133 MHz. They seem to be passing the mem tests at 2133 MHz. I used a live-image and ran the gnome-disk-utility to test the disks, and it says they're fine. One HDD has an old age reading, but that is expected as it's been around a while. The other disks are OK. All the temps are normal this whole time. I did go into BIOS and enable PWM on the extra fans, which I thought was enabled already.
IDK maybe the XMP profile is misconfigured ? Still need to install all 4 DIMMs and run a complete test on all the memory.