I think the CDS status is back to normal.

• Bit 2 of the C1RFM status word was red, indicating something was wrong with "GE FANUC RFM Card 0".
• You would think the RFM errors occur in pairs, in C1RFM and in some other model - but in this case, the only red light was on c1rfm.
• While trying to re-align the IFO, I noticed that the TRY time series flatlined at 0 even though I could see flashes on the TRANSMON camera.
• Quick trip to the Y-End with an oscilloscope confirmed that there was nothing wrong with the PD.
• I crawled through some elogs, but didn't really find any instructions on how to fix this problem - the couple of references I did find to similar problems reported red indicator lights occurring in pairs on two or more models, and the problem was then fixed by restarting said models.
• So on a hunch, I restarted all models on c1iscey (no hard or soft reboot of the FE was required)
• This fixed the problem
• I also had to start the monit process manually on some of the FEs like c1sus. 

Now IFO work like fixing ASS can continue...