Form what little bit of fluid residue shown in your pic Id wipe the cylinder down , check the 3 bolts on top of that strut and give them a light snug... one bolt is the banjo fitting bolt
I’d then cycle levelers several times while observing for any leaks. This is an easy Jon to remove the leveler leg..since yours is not one of the Front LG no need to add any extra support to remove and replace.
Here is a decent video on the removal and replacement.
https://youtu.be/ojHwfSHg2Ps
And I’d have it rebuilt as suggested instead of replacing.. most can be rebuilt as long as the internal piston is not scored too bad