As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE COMPLYING WITH SB 670SH-53-043 REV C WE HAVE DISCOVERED L/H FS 768 DIAPHRAGM TO BE CRACKED AT LOWER BEAM TO DIAPHRAGM LOCATION ON THE I/B VERTICAL FACE. DRILLED AND INSTALLED NEW SERVICEABLE L/H DIAPHRAGM FS 768 PN SH670-36145-5 IAW CRJ-900 SRM 51-40-11-001-001-A01, SRM 51-42-21-001-001-A01