As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- FORWARD SIDE OF REAR PRESSURE BULKHEAD HAS A HOLE DRILLED RIGHT NEXT TO RIVET HOLE 1.5 INCH BELOW HORIZONTAL BEAM VII AT BL 1050R. HOLE PASSES THROUGH PRESSURE BULKHEAD, DOES NOT GO INTO BACKUP ANGLE. REPAIRED IAW HORIZON AIR EA 4-53-1381.