Absolutely no need to apologize...
There are actually four series of Sea-Kings in the World. Sikorsky is the original, and the other three are licence built variants. Westland, Agusta and Mitsubishi all built significant numbers of this great aircraft under licence.
Tipping forward?
Too much fuel or personnel forward, not enough aft
Brakes seizing (common post maintenance item)
Taxiing (and stopping) with a significant tailwind
Pothole, drain or other ground hazard
Releasing cyclic with trim turned off
SAS or servo runaway
Mixing unit bellcrank or component failure
Flight control failure or interference (like tail wheel lock cable in flight controls)
Flight control hardware failure or lack of safety causing loss of flight control integrity
Something completely new that hasn't been seen before!