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As you have already replaced all of the relevant parts, are you in an area of extremely low or high humidity? As this can affect the toner transfer...
Some printers will also allow you to change the density settings of the ink and toner - these default settings may have been changed to low, causing you to get those faint prints.
If your printer does have ink/toner density settings, you should be able to find them once you’ve clicked on your printer in ‘Devices & Printers.’ If it looks like you’re printing at a low density, increase it slightly and then try printing.