Depressurisation causing electrics to fail
My theory is from the knowledge from what I know flying the 737.
If the cabin depressurises the cooling fans warning lights in the electric bay will go on ,as the thin air struggles to keep the temperatures cool in the electronics bay. This could result to systems shutting down or CBs popping due to over heating. Could result in the transponder failing
Just an idea anyone also think the same or disagree be good see