As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A PREVIOUS CRACK THAT ORIGINATED IMMEDIATELY AFT OF THE PORT CANOPY LOCKING HANDLE HAD BEEN STOP-DRILLED. IN FLIGHT A CRACK ORIGINATED FROM THE STOP DRILL LOCATION AND PROPAGATED TO THE UPPER PORTION OF THE CANOPY.AN ELLIPTICAL SEGMENT APPROX. 12 INCHES X 6 INCHES OF THE UPPER SIDE OF THE CANOPY FELL INTO THE AIRCRAFT. THE NEW CRACK WAS NOT THE RESULT OF A BIRD STRIKE OR TURBULENCE ENCOUNTER.