As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NO. 11 CYLINDER HEAD CRACKED CYLINDER REPLACED. A/C RETURNED TO SERVICE. ON A TRAINING FLIGHT FLIGHT, ONE WATER PICK UP WAS CARRIED OUT, LOAD WAS DROPPED ON TARGET, WHILE GOING BACK FOR A SECOND LOAD, THE MAP SHOWED A SUBSTANTIAL SPEED. VISUAL CHECKS OF THE ENGINES WAS DONE AND A SUBSTANTAIL OIL LEAK ON THE RIGHT ENGINE WAS FOUND. ENGINE WAS SHUT DOWN, SOON AS POSSIBLE.