Real-time fringe check revealed delay jump on all AT baselines. Based on times when the fringe finders were observed, the issue occurred sometimes between 03:31 UT and 06:58 UT (i.e. during the first 1/3 of the science block).
RFI may have affected auto-phasing for one of the supplementary fringe finders observed before the science block (J1337-1257?), but phasing was alright for the first 1740-517 at 03:32 UT. The array configuration is H214.
Cl1F1 PLL unlocked for ca04 in monica, nothing obvious in vis, probably doesn't matter.