While rebooting cp2006 today:
```
Enumerating Boot options...
Enumerating Boot options... Done
UEFI0107: One or more memory errors have occurred on memory slot: B2.
Remove input power to the system, reseat the DIMM module and restart the
system. If the issues persist, replace the faulty memory module identified in
the message.
UEFI0058: Uncorrectable Memory Error has occurred because a Dual Inline Memory
Module (DIMM) is not functioning.
Check the System Event Log (SEL) to identify the non-functioning DIMM, and then
replace it.
```
SEL features a few related events, one of which today:
```
$ sudo ipmi-sel -v | grep memory
8 | Feb-05-2016 | 19:05:57 | ECC Uncorr Err | Memory | Assertion Event | Uncorrectable memory error ; OEM Event Data2 code = C1h ; OEM Event Data3 code = 20h
13 | Jun-01-2016 | 17:52:21 | ECC Uncorr Err | Memory | Assertion Event | Uncorrectable memory error ; OEM Event Data2 code = C1h ; OEM Event Data3 code = 20h
21 | Mar-23-2018 | 16:55:08 | ECC Uncorr Err | Memory | Assertion Event | Uncorrectable memory error ; OEM Event Data2 code = C1h ; OEM Event Data3 code = 20h
```
The same thing happened on cp2010, SEL follows:
```
15 | Mar-23-2018 | 17:41:46 | ECC Uncorr Err | Memory | Assertion Event | Uncorrectable memory error ; OEM Event Data2 code = C1h ; OEM Event Data3 code = 20h
```