As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - FLT 601 - CLIMBING-OUT THROUGH 16000 FT AT 1302Z, NR 4 ENGINE LOUD BANG ALL PARAMETERS ERRATIC. COMPLETED APPROPRIATE CHECK LISTS. DUMPED FUEL TO MAX LANDING WEIGHT. RETURNED TO TJSJ WITHOUT INCIDENT. CUASE OF FAILURE CONTINUES. REMOVAL AND REPLACEMENT OF NR 4 ENGINE IN PROGRESS. CAUSE OF FAILURE TO BE DETERMINED AT SHOP VISIT. (M)