Preliminary Notice began at Addendum Phase, does it still cover invoices from original contract dated after the preliminary notice was sent?

We didn't prelim a project until we needed an addendum for a PARTICULAR phase. Does that still cover the left over amount on the original contract and the other original phases. What about addendum's for other phases or additional work in that same project? Or does it only cover that particular addendum for that particular phase going forward? i.e: Contract 645 has 3 phases. An addendum is signed for phase 1 of contract 645. The organization has just adapted the Levelset program, and sends out a preliminary notice for that addendum. Down the line, On that same contract 645, Phase 2 is approved for an addendum as well. Soon Invoices are being sent for both Phase 1 and 2 addendum's, as well as the original contract for Phase 3. If we are simply talking about the invoices sent after the preliminary notice was put in place, Which invoices under this scenario is covered under tat notice?