Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
You've got a couple of classic gremlins there! For the headlight issue, drilling a small hole to let the moisture escape was a good move, but moisture can still get in if the seal's compromised. Don't give up on finding a new headlight assembly, though! There are TONS of aftermarket options out there. Just give it a quick Google search, and you'll find a plethora of options. Use your VIN to whittle down the possibilities.
Now, for the rear noise, if you’ve already topped off the differential fluid but still hear that grinding, you might be dealing with some worn bearings or gears. Since it happens when you're driving uphill or on flat surfaces, it could be related to the load on the drivetrain. Insist the shop, take it for a longer test drive or, better yet, ask if you can ride along to point out the noise. Hope this helps and saves you some headaches!
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