I'm not sure what you want to achieve...
Try this:
SELECT Work_Order_No, Tech_ID, COUNT(*) AS Cnt
FROM SampleData
GROUP BY Work_Order_No, Tech_ID
HAVING COUNT(*)>1;
This will give you:
Work_Order_No Tech_ID Cnt
397129 1205 3
397595 1256 2
397595 1322 2
397595 1358 2
SQL Server 2019 | db<>fiddle[
^]