The PO15 is not that different from the earlier A-45,just a lot bigger.The compression release has no bearing on spark,it just makes for easier pulling to start.If you remove the rope plate held on by three screws on top of flywheel,you will be able to access and clean the points.Although the coils are usually good,you can use a multi meter to check resistance between plug wire ends.Next most likely culprit would be condenser and you’ll have to remove flywheel to access that.
