It doesnt seem likely both compressors have slide valve issues, though not impossible , sounds like fan staging to me, You need to there with gauges on , checking display transducers, pressures , temps to display ,remember you won`t have much time, A bit off subject but I had a carrier 30gx with oil fault that was driving me crazy , took me a few days to catch processor scrambling the oil pressures , scrolling like a maniac prodialog with gauges on, was a tricky one but got there , as will you good luck
Keep it simple to keep it cool!