 Moodys Investors Service Moodys upgraded CSI Compressco LPs Compressco Probability of Default Rating PDR to Caa1-PD from Ca-PD. At the same time, Moodys affirmed Compresscos Caa1 Corporate Family Rating CFR, its B3 senior secured first lien notes rating, and its Caa3 senior unsecured notes rating. 