What was found
AIR RETURN TO DEPARTURE, AIR CONDITIONING VAPORS FOGGED UP FLIGHT DECK SO INTENSE WE WERE UNABLE TO SEE FLT INSTRUMENTS, ON CLIMB OUT OF 5000 RECYCLED PACK AND TURNING HEAT WAY UP VAPORS WENT AWAY. REMOVED AND REPLACED VENTURI DP SENSOR IAW FIM TASK 21-51-00-810-812. OPS CHECK OF AMS OK, NO FAULTS NOTED. REPLACED RECIR FILTERS AS PRECAUTION. (K)