What was found
DURING CLIMB AT APPROX FL 260, GOT PACK 1 AND PACK 2 FAULT, WOULD NOT RESET. DESCENDED TOWARDS 10.000, PACKS RESET AT ABOUT 14,000. CLIMBED BACK TOWARDS FL 340, BUT BOTH PACKS FAULTED AGAIN AT APPROX FL260. DIVERTED INTO BOS. PERFORMED CABIN PRESS CONTROL AND MONITORING TEST IAW AMM 21-31-00-5. OP CKS GOOD. RAN NR 1 AND NR 2 ENGINES PER JRH. ENG BLEED VALVES AND PRESS NORMAL. A/C HAS NO HISTORY IN ATA 21 OR 36 FOR PRESSURIZATION. OK FOR SERVICE.