As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALT OF FL 330, DUCT SPLIT IS CONSISTENT AT 23 PSI. LEFT DUCT IS 40 PSI AND RIGHT PACK IS 17 PSI. OAT IS -50C AND ABOVE PRESSURES MEASURED AT 88.5% N1. GROUNDED - YES. ACCOMPLISHED HEALTH CHK TASK CARD NG-36WC-00002-2. REPLACED BLEED AIR REG REF B737-900 AMM 36-11-03. PERFORMED HIGH POWER RUN. R/H DUCT PRESS FAILED. 20%N1 L 20 PSI R 6 PSI, 60% N1 AND ABLOVE L-30 R-10.