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Q: red oily looking substance in expansion tank on 1999 BMW 323is

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I am leaving town and just checked my coolant to make sure I had pleanty. When I took off the cap, the coolant was all the way to the top and a reddish oily substance is floating on top. There was also some gunkie yellowish substance on the cap itself. A few weeks ago I had to have the tensioner pulley and V belts replaced. What is wrong?
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The belts have nothing to do with it, possibly a leaking auto trans oil cooler and the red fluid if ATF. Good luck
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