The free on-line (PDF) part 5 Using Kodak Flexicolor Chemical "5 Process monitoring and troubleshooting" (Z131_05) should help you diagnose most shifts as temp/pH/time vary from spec. for c41 chemistries. The response of each of 3 color layers is plotted in graphs starting at page 5-29. With them you can see the relationship that varying each parameter has on each color layer. Most useful in figuring what/where/howmuch you want to start modifying when working with "known" chemistry. If your working at weird temps, like 25C and non-standard chemsitry, you're kind of on your own to determine each effect. I suspect the information in the manual will still be somewhat useful. Don't have the link handy, but it's easy to find on-line.
Robert