As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TEST FLIGHT OVER PRESS RELIEF VLV DID NOT OPEN UNTIL THE CABIN WAS AT 9.4 PSI. 757 FTAM SAYS VLV SHOULD OPEN BETWEEN 8.85 - 9.25. R & R UPPER PN 103642-3, SN 108-1297 & LOWER PN 103642-3 & SN 108-1263. POSITIVE PRESS RELIEF VLVS IAW B757 AMM 21-32-01-2. PERFORMED STATIC SYS LEAK CHECK IAW B757 AMM 21-32-01-2, CHECKED GOOD.