Leak in wheel holes

I have an older Mirage Tandem kayak which has a leak in both holes made for a cart. In this model, the holes don't go through to the top of the kayak.
We found the issue by pressuring the hull and using soapy water...lots of bubbles from both holes. This was of course after a rather exciting "fun" kayak ride earlier in the day...luckily we were close to sure to get the water out.
I am looking for ideas on how to fix this issue. You cannot reach them internally through any access point on this kayak.

CCMY4624I405
I think that means it is an '05 model built in sept '04 ?

My kayak is similar to this:
viewtopic.php?f=11&t=52914

Any suggestions would be great.

Thank you.