The Melles probably need a new set of crystals...either that or the fiber launch has toasted...more likely the first. The AR coating seems to be less than friendly after a few years. Used to have one set but have since been used...taken from a laser that had no pump diode that was purchased very cheap for parts...R code laser head...flea-bay...no driver either.
I know that Fred at onestop had stocked parts in the past.
You are the only one that can make your dreams come true....and the only one that can stop them...A.M. Dietrich