What was found
DURING CRUISE AT 10,000 FT, ACRID ODOR, CHECKED NO C/B'S POPPED. WITHIN 1 MIN OF 1ST ODOR, WHITE/GREY SMOKE APPEARED. COULD NOT ISOLATE. WENT ON OXYGEN, RAM DUMPED CABIN PRESS, DECLARED AN EMERG, & DESCENDED. RAN SMOKE/FUMES & ELEC FIRE C/L. LANDED & EMERG EGRESSED ON TAXIWAY. MAINT RAN NR 1 & NR 2 ENGS. SELECTED NR 1 MAIN AIR VALVE TO OPEN, REMOTE PRESENCE OF ODOR, NO SMOKE/VAPOR DETECTED. NR 1 & NR 2 MAIN AIR VALVES OPEN, NO ADD ODOR, AFTER 30 SEC, ODOR CLEARED. R & I AIR CON SYS WATER SEP ASSY. FOUND WATER SOCK SATURATED WITH WATER & SOOT. R & R WATER SOCK. PERFORMED GROUND RUN NR 2 WITH SYSTEMS POWERED, ENG RUN AT T/O POWER, REDUCED POWER TO IDLE FOR 60 MIN. NO SMOKE OR ODOR DETECTED.