Hey Buddy,
Dryer sheets to start. If you check online or in auto part stores you can find tape that is treated somehow and ir repels mice or keeps them from chewing. When we first moved to th country we had a mice chew the wires in our Honda. It cost us 1K to get it repaired and the technician showed us what they used. It is an OEM product from Honda but they don’t normally install it on new builds. I found a link on EBAY for it. Also since we live so rural and travel a lot to doctors, fishing, etc we have had AAA for years and it is worth it’s weight in GOLD to us. We have AAA premier and 200 mile and less tows are free up to 5 or 10 total tows annually plus other services (lock outs, jumps and others) can’t remember all the details.
You mechanic has has some good suggestions as well.
OEM Honda 4019-2317 Rodent-Proof Electrical Tape 1ft **PER FOOT** | eBay
4019-2317 - Genuine Honda Tape,Rodent 19MM 20M
You can call HONDA with the OEM or search it online too, this is just a quick link from eBay. I used it for the description.
Glad you you were able to get it fixed.