Mate not good, these things happen to people as 'very individual' what I mean by that is these types of problem are widelydivided due to population.
Effectivly a complaint that will never make a difference to any other person, business is business and government is government.
Wouldn't rule out the SS owner using fuel tainted with ethanol actually anything tolulene even.
Thanks for the heads up! 50h is no good! If it were mine and out of warrenty a 500:1 dose of tcw3 in the fuel could delay matters although one of the problems with warrenty is it's nigh on impossible to do the best by the equipment at times due to the risk of voiding it.
cheers fnq