I gather it was not reported by the tech crew and was checked as a result of downloading the QAR.
Usually when hard landings are not reported by the flight crew, Tech has no idea of it unless in the book or reported by ACARS. The 74C had a nasty habbit of telling on the pilots as the fowler flaps would shift and cause some significant destruction upon retraction. A landing as hard as this may have very well created a fuel leak as an indicator, may take a few legs to find on a walk around... Or a self disclosure from someone who experienced it. This report stinks to me.