One high-level source said his “gibberish” typing may have jeopardized hard-won convictions by giving criminals the chance to claim crucial evidence is missing.

Kochanski’s botched transcripts include the 2010 mortgage-fraud trial of Aaron Hand, who was also convicted of trying to hire a hit man to take out a witness against him.

A source familiar with the case said Kochanski’s transcripts of that trial were a total mess.

“It should have been questions and answers — instead it was gibberish,” the source said.