Some interesting angles on attitude to maintenance, too 
I wonder how often the mag was overhauled since it was built in 1968?
I had a possibly similar thing here in the UK, where one FAA 145 & EASA 145 outfit refused to give me a copy of the work pack for the overhaul of my D3000 single shaft dual mag. I reported this highly suspicious situation to the UK CAA who were uninterested and suggested I have a cup of tea with the company and sort it out. Obviously I didn’t fly with it and sent it to QAA in Tulsa for an overhaul. £800 wasted, but…
