What was found
AIRCRAFT WAS NOT GROUNDED: CLIMBING THROUGH 13,400 FEET VERY VERY LOUD SQUEAL IN FLIGHT DECK, SOME SORT OF PRESSURIZATION LEAK AROUND FO SIDE NEAR WINDOWS. DESCENDED TO 10,000 ALL PRESSURIZATION INDICATIONS NORMAL. NOISE REMAINED. DIVERTED TO JFK AT 7000 STOPPED FOR REMAINDER OF FLIGHT. MAINTENANCE FOUND F/O EYEBROW DRAIN TUBE DISLODGED FROM CLIP AND CAUGHT BETWEENWINDOW AND SEAL CAUSING LEAK.. REINSTALLED DRAIN TUBE BACK UNDERCLIP ..PRESSURIZED A/C IAW AMM 05-51-91 NO LEAKS NOTED.