What was found
ON CLIMBOUT AT 12000, 310 KIAS WE EXPERIENCED A LOUD SQUEAL THAT SEEMED TO BE COMING FROM THE RT NR 1 WINDOW SLOWED TO 250 KTS AND LEVELED OFF AT 15000. SQUEAL WAS WORSE. DESCENDED AND NOISE STOPPED AROUND 9000 4.5 PSI DIFFERENTIAL PRESSURE < 200 CABIN ALT NOISE NEVER RETURNED THE NOISE INTERFERED WITH COCKPIT COMMUNICATION. GROUNDED - YES. DIVERSION TIME: 44 MINUTES - FOUND DRAIN TUBE FWD OF R2 BINDING WITH R2 SLIDING WINDOW, REPOSITIONED DRAIN TUBE, NO BINDING NOTED. RE-TORQUED R1 RT WINDOW FASTENERS PER AMM 56-11-11-400-821, PERFORMED CABIN PRESSURE LEAK PER AMM 05-51-91-790-801 OPS CK GOOD, NO PRESSURE LEAKS NOTED, NO NOISE NOTED. PRESSURIZED AIRCRAFT TO 7 PSI DIFFERENTIAL 3 TIMES NO DEFECTS NOTED.