What was found
DIVERSION, AT FL370, LOST PNEU BLEED PRESS DURING DESCENT, BLEED TRIP OFF LIGHT ILLUMINATED. BOTH DUCT PRESS INDICATORS SHOWED APPROX 65 - 75 PSI. COULD NOT DUPLICATE PROBLEM. PERFORMED PRESS DECAY CHECK, PRESS CONTROL CHECK AND BLEED AIR OPS CHECK OK PER MM. FOR MX CONVENIENCE, REMOVED AND REPLACED NR 2 POS 390 SENSOR (P/N 12966-2) & 450 SENSOR.