First you need to find the name of the table and the column holding the data, by executing the following SDP query report:
SELECT Tablename,
Columnname FROM ColumnAliases
WHERE Aliasname='Services'
Then you can retrieve the pick list values. For example:
SELECT Value FROM UDF_PickListValues
WHERE Tablename='WorkOrder_Fields'
AND Columnname='UDF_CHAR36'
Replace WorkOrder_Fields and UDF_CHAR36 with the values returned by the first query.