Serious memory error or safe to ignore?

I have a PowerEdge R640.  System BIOS Version: 2.8.1.  PERC H740P Mini, running perfectly fine since 2020-06-18.   Running VMWare ESXi.   Not even a hiccup.  Today, the only thing randomly went down.  

- Multi-bit memory errors detected on a memory device at locations DIMM_B2
- The system memory has faced an uncorrectable multi-bit memory errors in the non-execution path of a memory device at the location DIMM_B2

I powered down with the DRAC.  Then powered up and all seems fine 12 hours later.  My question is, what are the implications of this error?  Should I replace the DIMM?  Or is it fine again?