As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1214, DFW-BOS. 'DURING DECENTS R BLEED FAIL EICAS. AIR SYNOPTIC SHOWED VALVE OPEN AND PRESSURE. WOULD CLEAR WHEN THRUST ADVANCED, SEE PREVIOUS WRITE UP 8/19; PER FIM 36-11-01-04 REPLACED PRSOV (HP12) REF AMP 36-11-01 TEST OK ALSO SEE MDDR 520626.'