As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE EICAS WARNING AT FL380. COMPLIED WITH QRH, DESCENDED TO FINAL ALTITUDE FL250. RECOVERED CABIN PRESSURE IN AUTO 2 AT CABIN ALTITUDE 7500. NORMAL DESCENT AND PRESSURE UNTIL LFPG. REPLACED THE NR 1 CPC IAW MM 21-31-02-4, TESTED OK. COMPLYED WITH CABIN PRESSURE DECAY CHECK IAW MM 05-51-24-2, TEST PASSED.