What was found
CLIMBING THROUGH 4000FT A VERY LOUD SQUEEL FROM VICINITY OF THE FO BACK WINDOW BEGAN, LEVELED AT 6000' AND SLOWED A/C TO 230KTS. SQUEEL INTISITY LESSENED TO A DEGREE-A/C PRESSURIZED IAW AMM 05-53-00. NO NOISE NOTED. SMALL LEAK NOTED ON F/O FIXED WINDOW. REMOVED & REINSTALLED BACK IAW AMM 56-11-12. RE-PRESSURIZED, NO LEAKS NOTED. DOME NUTS, FRAME, HARDWARE & WINDOW INSPECTED. NO DEFECTS WERE NOTED. OPS CHECK GOOD IAW AMM 30-12-00. NO FURTHER DEFECTS NOTED. A/C OK BACK TO SVC