NEW YORK--(BUSINESS WIRE)--Fitch Ratings upgrades Merey Sweeny, L.P.\'s (MSLP) $350 million ($188.5 million outstanding) senior unsecured bonds due 2019 to \'BBB+\' from \'BBB\'. The Rating Outlook is Stable. KEY RATING DRIVERS The upgrade and Stable Outlook are linked to Fitch\'s view of the credit quality of Phillips 66, which guarantees the full and timely payment of debt service. Sponsor Bond Guarantee for Debt Service: Phillips 66 and Phillips 66 Company irrevocably and unconditionally guarantee
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