if the majority hatched and its the same breeds remaining, you can try to tap candle and see whats going on..... see the links below before you start
LOCKDOWN, DAY 18, CANDLES, PIPS, ZIPS
*IMPORTANT INFO= TIMELINES PIPS ZIPS!!! & MARKING AIR CELLS DAY 18, DRAW DOWN, INTERNAL PIP, EXTERNAL PIP, and ZIPPING post #35770
Eggs UNHATCHED at end of Incubation
Step by Step Guide to ASSISTED Hatching - Click HERE
I HAVE EGGS LEFT UNHATCHED NOW WHAT? post #25223
tons more info HERE http://www.backyardchickens.com/a/incubating-w-friends-helpful-notes-links-informational-post-links
Thank you. I swear i read up every day on all sorts of egg hatching info on BYC but there is always more i seem to have missed.