KonaJK

MKZ Hybrid Transmission leak (at 101k miles). Thought it was oil leak but confirmed coming from transmission. Car runs fine, no gear issues or high rpms. However, it will start whining noise when idle. leak continues- (I know it fluid must be filled by authorized dealer). Questions: want to resolve issue the lowest cost way…could I have the tranny re-sealed (gasket) and re-fill tranny fluid? Or is this a more substantial issue requiring repair or total replacement? I appreciate any feedback!