As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CCR GPM 1L EICAS STATUS IN FLT FL 400 - LOST CABIN, REGAINED CABIN AT FL 360. RESEATED GPM L1 IAW DMC-B787-A-42-21-02-00A-520AK, DMC-B787-A-4 2-21-02-00A-720A-A. INSTALLATION TEST PASSED. CABIN PRESSURE GND TEST PASSED IAW DMC-B787-A-21-31-00-03A-320A-A. CAC COMMON STARTER TEST IAW DMC-B787-A-24-15-02-00A-320A-A, TEST PASSED.