As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM: DUCT PRESSURE SPLIT 40 PSI SPLIT IN CLIMB (L 50/R10) PSI 26 PSI SPLIT IN CRUISE (L40/R14) PSI 20 PSI L AND R ON DESCENT. ACCOMPLISHED ENGINE BLEED AIR SYSTEM HEALTH CHECK IAW B737-800 M/M 36-11-00 FOUND NR 2 ENGINE 450 DEGREE F THERMOSTAT AT FAULT REMOVED AND REPLACED NR 2 ENGINE 450 DEGREE F THERMOSTAT IAW B737-800 M/M 36-11-05, OPS CHECK NORMAL.