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I would suggest to replace the power supply board, One can be found from these links or you can search for others, the part number is XXXXX on the board or on the link. Hope this helps.
I have not ran across anything indicating bad rectifiers, usually if a rectifier goes bad it will short circuit causing the main fuse to open, If this is not the case I would not suspect the rectifier. If you would like to purchase a service manual here is a link to a download manual. Sorry I can't be of more assistance. Good luck