US West Inc, Englewood, Colorado has had its preliminary A-plus rating on its senior debt affirmed by Standard & Poor’s Corp, but the outlook is negative. The affirmations follow the company’s plans to buy back up to 12.8m of its comon shares. The outlook of the debt and the holding company’s related entities reflect the limited capacity at the current rating to debt-finance additional cable television acquisitions and bid on Personal Communications Services licences, the agency said.