Background Context: I bought a business 11 months ago. The cashflow was down by 20% 1 month before closing but I never renegotiated the price (desperate to buy the business and it was a mistake, I know). The business also had customer concentration with one customer who was accounting for 20% of the revenue. This was a customer with them for 14 years. This customer can only make decisions through a court appointed fiduciary (details immaterial). Two months after closing this client's new court appointed fiduciary emailed through a lawyer that they are firing our business. They then sent a legal letter listing all of the violations that the prior owner did over the years. Around 20% of the sale price is seller note. I have paid off 20% of this seller note already.

Question: Is it worth asking the seller to reduce the seller note amount given the prior issues in the business? I know I probably have no legal recourse (or do I?) and I know it is 11 months post sale. But there is no connection with the seller and the business and part of me is wondering what could I lose by asking. Any thoughts?