When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
No seriously - I've never seen orange but it doesn't look good. Could it possibly be a rust preventative that was sprayed into there a long time back that is weeping out due to heat or? Reminds me of cosmoline actually...
Can you remove the trim piece via screws to get behind it? Could it be the trim piece that is rusted and then is bleeding down onto the jam area?