As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONDENSATION FROM AIR CONDITIONING CREATES A THICK FOG IN FLIGHT (FLIGHT 3906). THE FOG IS BAD ENOUGH TO OBSCURE THE FLIGHT INSTRUMENTS. FOG COMPLETELY OBSCURES THE CABIN SO THE FLIGHT ATTENDANT CANNOT SEE THE PASSENGERS. REMOVED AND REPLACED LEFT AND RIGHT WATER SEPARATOR SOCKS IAW AMM 21-51-13. OPS CHECKED NORMAL.