AD's

The FAA still has a search function

drs.faa.gov/browse/ADFRAWD/doctypeDetails

You can search with the model 415C or with Univair then the model number. You also need to be aware of ADs for all other components and accessories, i.e. engine, prop, magnetos, ignition switch, etc.

This might be your best list.
resources.univair.com/docs/ercoupe-forney-alon-m-10-cadet
Once upon a time, the FAA had a searchable database by make and model, but it appears that no longer exists.

Is there a published list of all the AD's on the 1946-C coop?