Hi, I'm a subcontractor that installed a new roof on a residence (single family dwelling). We finished the work on May 18, 2021 (just short of 1 year ago). The invoice to the general contractor back then was $7,565.29. That GC did make a partial payment of $2,000.00 to us towards this job - but later said that he wanted to deduct some money from the balance that was owed to us for what he said was some "warranty" work on yet another (commercial