I’ve had the Furman PST-8 for just under 4 years, it is behind the stereo rack out of sight. From reading this thread I decided to check that the "Protection-OK" light was on indicating all is well.
It wasn’t on so the unit is basically a fancy power strip at this time, with "maybe" some unspecified level of power protection left. Funny enough, a much older surge protecter in the same receptacle which also has a power protection light is still working.
Called Furman and as mentioned earlier in this thread (I think this one) there is no internal fuse or reset mechanism. Basically said try unplugging it for 10 minutes but don’t expect much. No luck.