Problem(s) Encountered:

We encountered an OWL failure where it would not connect to the detector. We attempted to simply restart the OWL application but this did not solve the problem. We emailed Eric for help with rebooting mdmarc2 in hopes this would solve the connection issue, however this did not work either. Rob Fesen came down from the 2.4m and power cycled the detector and re-seated the fiber cable. Re-seating the fiber cable fixed the problem.  No further problems encountered after this fix. 

Solution:

I’ve never understood exactly why reseating the fiber is often the fix for this problem.  My only guess is that the spring-loaded connector may be getting weak and occasionally loses connectivity.  As it happens, I already have a spare fiber pair run from the computer room to the telescope, so I have swapped in the spare pair.  We’ll see if the problem still occurs or not.

UPDATE:  No failures after 8 nights.