Onan diesel 5500 generator oil leak

So we bought a used dp this last winter with a diesel onan generator. Generator and coach fairly new. Generator had 15 hrs on when we bought it. We have used it a ton so far this summer and changed oil last weekend. Prior to oil change it was starting to leak oil saw drips about 150 hr mark. I changed oil out before our big trip to Grand Canyon and degreased everything I could spray and rinse with water. It still had a few drips under it with it not running I figured was residue from prior. On trip now and it's dripping again from front right below the fill tube area and blowing back by panel near the oil filter. I know filter is not leaking verified before i put panel back on and that is way back from where majority of drips are from. Anyone else have similar leak and tell me what they did to fix?
Thanks for input