Re: STS 61
The flight to repair the HST was NASA's greatest achievement in the 90's.
The HST had a flawed mirror and astronauts were sent to repair it and the science we got was tremendous!
Of course, if there's a flaw to the NGST at L2, it's going to be extremely difficult to repair it. Unless some robot technology could replace humans even in very fine dextrous movements. It could be the case.
Raoul