The owners of Hawthorne Race Course, who have not been able to get loans to build a casino, also have failed to pay major construction bills, records show. At least four liens were filed in recent years against Hawthorne or its owners, Carey Heirs properties LLC, by contractors saying they were owed $6.7 million. The debt calls further into question whether Hawthorne can get financing to build a planned race track/casino combination, known as a racino. Hawthorne officials said they settled one of the claims, and plan to pay the debt as soon as they get financing for the project.