We have a winner, and it is Corran!!!
Thefindlab.com wrote back to me today:
"Thank you so much for being patient with us while we took time to look at your negs.
The yellow tint you see is indeed from the scanner leaking light through the sprocket holes as it's being scanned. This happened because we scanned your rolls on the Frontier so you could see the sprocket holes in the scans. When we do this we are actually scanning your pano frame on a 6x7 mask since this the only way to do it.
When we pulled your negatives I had one roll rescanned on the Noritsu. This doesn't allow for the sprocket holes to show up, but it does give you a cleaner scan since it is more light tight. I've included a frame for an example
We're more than happy to have these rolls rescanned for you on the Noritsu, if you like. Just let us know if that's your request. Thanks Huss!"
I am so happy w them that I sent in more film today. Excellent service and great prices. And thank you Corran, for in my email to them I mentioned the light leak through the sprockets as a possibility. I'm sure that made them look for it.
The sample they sent me looks great. Here it is, unedited (I will adjust once they send me the full rez uncropped scans)