As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED BACK INTO CMH WHEN EMERGENCY PRESSURIZATION LIGHT CAME ON AFTER TAKEOFF, EMERGENCY PRESSURIZATION CHECK LIST FOLLOWED. - FOUND WATER SEPARATOR COALESCER WATER SOAKED, REMOVED DRIED OUT AND RE-INSTALLED COALESCER, LEAK CHECK GOOD IAW CESSNA 560 MM CHAPTER 21-70-00.