The check engine light comes on when the computer is storing a code. Some conditions come and go, so the computer will no longer turn on the check engine light if it does not sense the condition after normally 3 warm up cycles. It will however continue to store the code, and will turn the light back on if it senses the fault again.
I assume you do not have a code scanner, but they are available for purchase. There is a user on this site, omey, that has a very informative web site that covers some of the different types of scanners available.
Anther option is to take your rig to an Advance Auto Parts store, and I believe they will scan your computer for codes free of charge. You can then look up the code to determine the condition the computer is warning about. This will allow you to either address the issue, or it could well have been something that was done while the work was being performed, and is something that no longer applies. At any rate, they will also be able to reset the computer so it will no longer store the code if the problem has been resolved.
2011 Winnebago Vista 30W
Duane, Precy, 9 year old son Matt, and Abby, our American Eskimo.