Here’s the cow’s & Easter eggs list.
http://hem.bredband.net/b257182/Cows%26Easter.htm#J
“ 7R + 1L + 1R + 1L + 7R + 1L, Credits
20R + 1L + 23R + 1L + 21R + 1L
23R + 1L + 1R + 1L + 7R + 1L
1R + 1L + 2R + 1L + 3R + 1L
10R + 1L + 15R + 1L + 14R + 1L, Hi
12R + 1L + 5R + 1L + 19R + 1L, Hi
20R + 1L + 13R + 1L + 11R + 1L, Congratulations
9R + 1L + 13R + 1L + 12R + 1L
1R + 1L + 3R + 1L + 5R + 1L
4R + 1L + 1R + 1L + 20R + 1L, Time/Date “
One of those is probably it