My ceiling has a gross cosmetic defect. Builder attempted to do a short fix twice using another Drywall company. It is worse. It needs to have the entire ceiling skim coated. It is still under warranty. The builder and his staff refuse to repair it. They said they only need to make one attempt at repair. I am now working with Business Regulations to enforce the terms of our warranty. The builder is not cooperating at this time.
My advise is stand strong and do not be strong armed by these contractors. They need to uphold the terms of their warranty.