This server was hitting "FRB2" timeouts:
# 2062 | 12/21/2022 00:51:40 UTC | CIMC | Watchdog 2 BMC_WATCHDOG #0x6e | Hard reset. Timer Use: BIOS FRB2 | Asserted
But that stopped after CMOS was cleared:
# 206d | 12/21/2022 01:10:08 UTC | BIOS | System Firmware Progress #0x06 | System Firmware error | CMOS/NVRAM configuration cleared. | Asserted
After that it seems the server might be hitting something similar to CSCvu14656:
0:2022 Dec 21 01:10:31 UTC:MRC status = 00000002
But the server is on much older CIMC 3.1(26a) firmware which should not be impacted by CSCvu14656.
Several DIMMs show prior ECCs with A1 showing the most.
I would try removing DIMM A1 to see if the server gets further in POST.
Maybe go down to 1 DIMM per CPU (A1 and G1) to see if the server gets further in POST.
If DIMM juggling doesn't work, then I would try to upgrade/downgrade firmware to see if this is a firmware issue.
Hope that helps.