I was just starting mine and never noticed these no`s missing till you said. likely it will be void and double money next week. Happy New Year to you too.
I had a go at getting the answers from the letters avaiable of clue 15,17and 19 down.
19d S?N?C I think is SONIC
17d O?E?A can it be either OPERA or OMEGA?
15d S?I?U?S looks like SAIQUES
Mind my wordfinder is a bit prehistoric