here is what happened!

You are lucky to get the LUD so fast after the first 2.
The 1st LUD: Mail room received the RFE.
The 2nd LUD: Mail room contractor check the RFE is the correct with what requested.

The 3rd LUD: RFE combined with the original 485 file and sent to the original IO for final review.

Mind RFE returned on 01/30 and got LUD 01/30 and 01/31. Since then, no LUD. I am stuck at the TSC.

Wish you go green soon.