Partial Dead Circuit/Breaker

Shop vac in attic receptacle killed attic lights, attic outlet, doorbell power.

I assumed I either overloaded the circuit or grazed an uncapped low voltage wire left following some AC repairs. Ended up replacing outside AC and thermostat after what we think was a power surge fried those along with some low voltage components on the attic handler. Our washer crapped out a couple weeks later, maybe related, maybe not.

No breakers tripped and I don’t know what breaker the attic lights/outlets and doorbells are on, opened panel and everything seemed in order. Killed power to entire house and changed attic receptacles and light switch, still nothing.

Appears like these are at the end of the line, so I asssume bad junction somewhere or a faulty breaker. Maybe a grounding issue given the growing list? Any other ideas?