Both hoppers should have
coins up the chain.
Take both hoppers out, empty them and make sure they are clean of dirt along the chain (8 screws to take apart if needed), sometime a dime will get stuck in there.
When hoppers are empty turn the "T" to make sure they turn freely.
If everything looks o.k. take out the plate behind the hoppers to check if their is an obstruction to the two LED, if its clean, replace both LED lights (even if you see red lights, they could be too week)