Update: I reached out to the original builders with whom I have a warranty. They allowed me to pick a repair date in January but I have to let them know by EOD today. I let my tenants know that I managed to postpone this repair by a month, but they sent back a very strongly worded email about how they're old, immunocompromised, and they've been great tenants, letting other repairs in, keeping me updated on any issues, etc. They've offered to pay for the dimmer switch and installation themselves.
At this point, I don't want to argue with them anymore. While I recognize I have the right, per my lease, to give them due notice and enter anyway, I'd rather not do that. What's my next step? I won't be using my warranty, so do I take them up on their offer to pay for the repair or do I have to eat that cost? Is there even a way for me to take them up on that so that 3 months from now, when COVID has died down, they can't just change their mind about the cost? My lease certainly doesn't cover this issue.... Any advice would be great.