My Gv-900e Became Unusable After 3 Sec. Head Cleaning Cassette...

I was acquiring video into FCP 6 Through "Log and capture" and everything was working fine, as usual. After six or seven Batch captures on the same reel, FCP gave me a capture error of this one clip, stating the error could be from the cassette.(which I could perfectly view in GV-900E). I used the cleaning cassette for 3 seconds on the deck and upon inserting the cassette I was editing, everything was black, no image black display. Send it to repair at a so called Sony authorized repairer and they tell me it is unrepairable since Sony has no parts for this equipment... Can you please be of some help here ? Thank you. Pedro Baptista