When you test the forks, are you using the front brake? Could be calipers/pads moving about making noise? Are headraces OK? Wheel spokes tight & not pinging against eachother?
If forks move OK, no play and not sticking, probably OK.
To change fork oil, the tops need to come off to drain oil. You could use a syphon hose, I suppose (sic) but not all the old f/oil will be drained out that way. Best to invert them - so its take them off or turn bike upsidedown!!!!
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