As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PLENUM BOXES DO NOT FIT CONTOUR OF NOSE PANEL. OUTBOARD AFT EDGE HAS 1/4 INCH GAP BETWEEN PANEL AND PLENUM BOX. DIMENSION ON NEW PLENUM BOX DOES NOT MATCH THE PLENUM BOX THAT WAS REMOVED. ALSO REMOVED -2 PLENUM. SHIMMED THE GAP ON BOTH AIRBOXES ON INSTALLATION.