Flat revenues and rising costs may portend some trouble for Allegheny County, but the results of an audit released yesterday had the chief executive crowing about his success over the last year. Controller Mark Patrick Flaherty said he released his audit of the 2006 budget before the end of the first quarter of 2007 to give the county time to adjust its spending before its too late to make a significant difference. "The good news is this is the third year in a row that we didn't raise taxes, lowered the outstanding debt and increased the fund balance," Mr. Onorato said.