F135 problems investigated

Pratt & Whitney are investigating problems with the fan blades of the F135 turbofan which will power the F-35 JSF. The tips of some of the blades broke off damaging the jet engine during a ground test. The tests were on an engine which has already clocked up 8 years of simulated service life. So that should helpfully give P&W plenty of time to fix the problem experts say. That is reassuring huh?