I just went through this very same issue. A shop had recently replaced the relief valve on the tank and neglected to remove the original o-ring. So I had two o-rings in place and both were mangled due to them trying to tighten everything down.
Pelican hooked me up with o-ring dimensions (47x4) and Pep Boys hooked me up with free o-rings. 5 minute job to replace it, but be careful tightening down those screws into the plastic housing.
Got the low coolant level light for a few days even after topping off, but I had lost nearly a gallon of coolant and figured I had air in the system.
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