AUSTIN, Texas--(BUSINESS WIRE)--Fitch Ratings has assigned an 'AAA' rating based on the Texas Permanent School Fund (PSF) and an 'AA+' underlying rating to the following unlimited tax (ULT) bonds for the Mansfield Independent School District, Texas (the district): --$48.53 million ULT school building bonds, series 2015. The bonds are expected to price via negotiated sale the week of July 27 subject to market conditions. Proceeds will be used to fund facility improvements. The district's $745 mi