What was found
HNL - FLT 09 - LOG PAGE: 4917181. DURING CRUISE (WITH NR 2 PNEU SELECTOR PLACARDED INOP AND NR 1 PNEU SYS TEMP HI LIGHT ILLUMINATED. PERFORMED EMERG CHKLST AND DOWNLOADED TO 2-PACK OPERATION (NR 1 AND NR 3 PACKS ON, SUPPLIED BY NR 3 PNEU SYS. WHEN NR 1 PNEU SELECTOR TURNED OFF, TEMP AND PRESS DECREASED. TEMP 265 DEREES CELSIUS PRESS 45 PSI). NR 3 PNEU SYS PRESS INDICATION DROPPED TO ZERO AND BEGAN FLUCTUATING BETWEEN ZERO - 60 PSI. APPEARED TO BE ONLY INDICATION AS NR 1 PRESS REMAINED CONSTANT AND CABIN RATE NEVER FLUCTUATED. REMOVED AND REPLACED NR 1 ENG FAN AIR VALVE TEMP CONTROL SENSOR. REMOVED AND REPLACED PNEU CONTROLLER. OPS LEAK AND CHECK OK. REF: OPER CNTRL NR HALA9900009 AND 99ZZZX572.