RB1100AHx2 Fails memory test

Device was in production and became unmanageable but still passing traffic. Power cycled and it failed to boot. Tried Net Install and device hangs at loading kernel code. reformat Nand and tried again same thing. Tried a bios memory test and the device hangs almost immediately after “filling addresses” (esc key doesn’t work immediately after starting the memory test.

Is this a dead DIMM Problem ? It looks like trying to find a compatible memory module for this board is pretty difficult ?

Any suggestions ?