As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING SB670-53-045, FOUND LH FRAME SECTOR AT FS235 TO BE CRACKED. REMOVED AND INSTALLED NEW SEVICEABLE LH FS235 FRAME, UPPER FRAME SECTOR PN: CC670-34133-9S (MHIRJ PCN-CC670-34133-7-8-091720151029) IAW CRJ900-SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01, 51-40-11-001-001-A01. THIS IS A PERM REPAIR