Make sure you are accessing this file directly from www.steam-brite.comIt seems you are trying to get it from https://steam-brite.com/literature/schematics/index.php?dir=Mytee%2FPartsLists%2F&file=8020-PartsList.pdf
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http://www.steam-brite.com/literature/schematics/index.php?dir=Mytee/PartsLists/