Troubleshooting memory pressure - how to avoid paging out SQL Server?
a significant part of sql server process memory has been paged out


Let me explain you what this message means. This means SQL Server process was paged to disk because the OS or applications running on OS requested memory and OS could not find continuous chunk of it so paged SQL Server to disk, temporarily, and provided the physical memory to the process requesting.

If you read Karthick PK's blog there are couple of situations where SQL Server Process working set might be paged out by Windows 


If windows is not sending the correct notifications to all listening processes at the right moment and thresholds.
If SQL Server is not responding fast enough to the low memory resource notification from Windows.
When low physical memory notification is received by SQL Server it will scale down its memory usage by trimming internal caches. This effect is applied for 5 seconds and then paused for 1 minute. This is to avoid any hungry/faulty application to consume all the memory making SQL Server to  scale its usage continuously. If low memory conditions still exist after 1 minute pause, the effect is applied again. So if there is physical memory pressure even after SQL Server scaling its usage for 5 seconds windows will still page out SQL Server’s working set.
Conditions in Windows where working sets of all processes are trimmed.
Windows might decide to trim a certain percentage of working set of various or specific processes


Why did SQL Server allowed OS to take away its memory, well this is how SQL Server is designed.


  should I raise the Minimum server memory to 1740 too?


I don't know from where you got this idea, min server memory has no role here don't touch it. Its OS which is facing memory pressure here NOT the SQL Server. 


  We received an alert at 12:15:37 PM on the wrsleic1 default instance that "a significant part of sql server process memory has been paged out."


As I can read your question you got this message previous year and one occurrence now. Keeping its mind in occurrence I would suggest its not that grave issue something running on OS sometimes requests more memory and SQL Server becomes victim.

Workaround

The workaround would be here to provide SQL Server service account Locked pages in memory privilege. This will avoid paging out of buffer pool but non buffer pool can still be paged out.

Solution. 


Find out what is that which is running on system and requesting more memory. Perfmon counters Process: Private bytes and Working set can come handy here.


Or download RAMMAP tool, that is there is Karthick's blog, and see memory consumption. 


What I can feel is there are other services running on SQL Server machine and sometimes there occurs situation where memory requirement increases and thus forcing OS to take hard step of paging. I suggest you also add more RAM on windows machine