Rear proper speaker no audio

New to the discussion board. Bought a 2020 F150 about 2 months in the past and had a subwoofer put in two weeks in the past. Unsure if I simply did not discover earlier than however my proper rear speaker is not taking part in any audio. Ordered new audio system pondering it received blown through the kicker key 500.1 tuning course of and it nonetheless would not work. Went again to the man who put in the subwoofer right this moment and we’re pondering it is a unhealthy channel on the ACM. He did not faucet the rear audio system behind the top unit for the subwoofer simply the entrance which each nonetheless work. We took a tone generator on to the inventory plug behind the top unit and the speaker labored. No bending or build-up on the prongs within the ACM or unfastened wires on the harness. Unsure the place to go from right here, referred to as the dealership and so they mentioned it was $1,000 only for the ACM not together with labor. Looking for perception on some other potential causes. Have scheduled an appointment after I get again from trip subsequent week to get a second opinion from an audio store.