As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RH PACK FAULT - R PACK OVERHEAT AFTER POWER UP ACFT WITH APU WE COULD HEAR A RUMBLE NOISE IN THE MID-CABIN ON THE RIGHT SIDE. THEN: R PACK FAIL/R PACK OVHT ON THE EICAS WITH: 21 R PACK OVHT - R PACK INOP ON THE INFO PAGE RH ACM REPLACED. (TC# 20190424004)