What was found
CLIMBING THROUGH 6000 FT, NR 1 BLEED LEAK EICAS MESSAGE PRESENTED. COMPLETED EPC & AOM 1 PROCEDURES. MESSAGE TOOK ABOUT 2 1/2 MINUTES TO CLEAR, BUT CLEARED. DIVERTED & RETURNED. REMOVED AND REPLACED LT PACK VALVE AND Y-DUCT IAW AMM 21-51-01 AND FLEX DUCTS ON LT PACK TEMP CONTROL VALVE IAW 21-60-01. LEAK CHECKED GOOD IAW AMM 36-00-00, NRWC'S 618-DFW-02033, 02034, 02043 AND 02052. PERFORMED LT FUSELAGE AIR BLEED DUCT LEAK TEST IAW 36-00-00. FOUND BLEED JOINTS 17 AND 25 TO BE LEAKING AIR AND REPLACED O-RINGS. PERFORMED LT FUSELAGE AIR BLEED DUCT LEAKAGE TEST AFTER REPLACEMENT OF O-RINGS IAW 36-00-00. LEAK CHECKED GOOD.