Have been away on holidays and only just now have processed my data from April 7th. There is a rather interesting and quite well defined bright spot in the C ring. At first I thought it may be a background star but now I am not so sure, it is too well defined.
Have not previously used WinJUPOS to measure ring detail but these are the measurements I get. For the RGB at 18:00 UTC, L3 (Ring) 11.8, R (Ring) +1.439. For the RGB at 18:24 UTC, L3 (Ring) 24.4, R (Ring) +1.445.
The bright spot in the C ring is also visible in my R data but not in IR.