Flew on N37510 last night from SFO to IAD, right before take off, warning light came on, and they spent 15-20 min to fix it, after arriving at IAD this morning, they assigned it to bunch of flights, but it never left IAD and caused bunch of delays:

UA2602 - 2.5 hrs delay
UA2623 - 4.5 hrs delay
UA326 - so far 2.5 hrs delay
and finally they decided to take it off the service!