What was found
DURING WING AND ENGINE ANTI-ICING USE CABIN CONTROL WITH AUTO 1 SELECTED, WITH 7.0 UNITS OF DIFFERENT TO LAND, 9500 OF ALTITUDE WITH STRONG PRESSURIZATION SURGE. THIS CONDITION WAS PRESENTED AT 35.000 FT WITH CABIN 2 SELECTED INDICATIONS WERE NORMAL. WAS REMOVED AND REPLACED PRSOV IN THE RT ENGINE IAW AMM 36-11-09 PAGE 401, THE SENSE LINE OF VALVE WAS ADJUSTED AND THE LEAK WAS ELIMINATE. IN THE LT ENGINE THE PRSOV WAS REMOVED AND REPLACED IAW AMM 36-11-09 PAGE 401. ENGINE RUN UP TEST WAS PERFORMED WITH SATISFACTORY RESULTS, BLEED AND ANTI-ICE SYSTEM NORMAL IAW AMM 71-00-00 PAGE 201-273 RT PRSOV P/N ON AND OFF:773288-8 S/N OFF: 890815 LT PRSOV P/N ON AND OFF: 773288-8 S/N OFF:900415