Balance sheet won’t balance - help please!

Hi guys:

I'm making a model but my balance sheet won't balance in the projected period by a certain amount. Each year the amount is different. What are the best ways to de-bug this issue and find out what to do to fix it please? I can't seem to search the specific mid-matched amount by Ctrl F on the excel sheet... I think it's caused by a combination of a few different amounts? In that case (when it's caused by multiple items), what's the best way to find the issue please?

Thank you!