When rebooting restbase1016, it stopped the boot complaining about a broken memory DIMM:
UEFI0107: One or more memory errors have occurred on memory slot: A2. 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. UEFI0081: Memory configuration has changed from the last time the system was started. If the change is expected, no action is necessary. Otherwise, check the DIMM population inside the system and memory settings in System Setup. 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.