Hi just wondering if anybody has ever successfully rebuilt a PGM 4 unit before? Mine has retired after ten years and it cost like 950 USD for a brand new one....I have heard rumors they can be rebuilt cheaply, but the black packing goo inside is a problem when you need to remove it....any electrical engineers here??? I am broke now and can't afford 950 for a new one if I can repair mine for 3 dollars in little parts