As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALTITUDE EN ROUTE FROM IAD TO PHX FLIGHT ATTENDANTS REPORTED ALL LAVATORIES INOPERATIVE. LAVATORIES WOULD NOT FLUSH PROPERLY. AIRCRAFT DIVERTED TO CMH WHERE MAINTENANCE FOUND EXCESSIVE PAPER TOWELS CLOGGING THE DUCTING AT AN ELBOW TO TANK CONNECTION BAFFLE ASSEMBLY. MAINTENANCE REMOVED DEBRIS AND OPERATIONAL CHECK OF THE LAVATORY SYSTEM NORMAL.