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Please be aware the CME will be deleting UDS on Eurodollar Options tonight: 

CME Group will be deleting all User-Defined Spread Instruments (UDS) on CME Eurodollar Options Market Segment 50 during today’s maintenance window, 5/30/2019. Any UDS with resting GT orders will not be deleted.

As a reminder, UDS instruments can be deleted midweek. When this occurs, CME Globex sends a Security Definition message (tag 35=d) with the instruction to delete the instrument with tag 980-SecurityUpdateAction=D (delete). 

A tag 48-SecurityID value from a deleted instrument can be reassigned to a newly listed instrument within the same week; therefore, CME Group strongly recommends the client system process the Security Definition message(tag 35=d) with the tag 980=D as received. 

If you have any questions, please contact the CME Global Command Center in the U.S. at +1 800 438 8616, in Europe at +44 20 7623 4747 or in Asia at +65 6532 5010.

The sender provided the following contact information. 
Sender’s Name: CME Global Command Center 
Sender’s Email: 
Sender’s Contact Phone: 1800 438 8616