As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED A ONE INCH CRACK ON PANEL 412CT AFT OUTBOARD NUT PLATE SUPPORT BRACKET. MAINTENANCE REMOVED AND REPLACED THE AFT OUTBOARD NUT PLATE SUPPORT BRACKET ON PANEL 412CT IAW BOMBARDIER Q400 SRM 51-40-07 & 51-40-15 AND Q400 DWG 85713052.