ERROR: NO data in TDC datascan = yadda yadda yadda
I wasn't able to see trouble from the counting house... and suspected that the trigger was missing from the F1TDCs. Took an access to investigate.
Sure enough... the ECL copy of the Level 1 accept from the level translator failed on that specific channel. All other outputs were just fine. Strange timing/coincidence: it failed in between runs 2205 and 2206 (target change from LH2 to Carbon).
I moved the F1 trigger cable to another ECL copy of the level 1 accept, and the ERROR messages disappeared.
TDC data from cosmics look fine.