Hi there, We have a Subway store we did some work at in Chicago, Illinois. We completed on 9/30/2019 and invoiced on 11/12/2019. We went back to do warranty work on 2/4/20. This customer still has not paid us and is asking for a 120 day extension on payment. I have a few questions: 1. Is warranty work considered last lienable work or would we use the 9/30/2019 date? 2. If we extend the payment terms another 120 days what should we do to protect ourselves? Would drawing up another contract make the lien start date renew? We want to make sure we are protected within the file-able dates.