Is this restorable?

Current trainee; a big part of me is saying this is unrestorable due to subgingival caries but the senior dentist wants me to do a restorability assessment with a view to do RCT+crown. How would I go about doing the assessment? I assume once I remove the caries, it would go into the pulp and then would it be symptomatic unless I extirpate? Pls help a new grad out.

It is asymptomatic (pt presented with a lost filling). Positive to EPT and Endofrost. Thank you

Thanks