Need help fixing an old Fenix LD20

Hey guys,

I lent my mother an old fenix LD20 I had laying around with a couple of eneloop batteries. She didn't realize those were rechargeable, replaced them with elcheapo supermarket AAA batteries and left the flashlight sit for a few months.

My mother says the flashlight worked great last time she used it, but when I got the thing back, one of the batteries had leaked inside the flashlight.
I managed to take the leaking battery of the body tube (no easy task), and clean most of the gunk from all the parts, but the flashlight doesn't work anymore. Any ideas?

Here are some pics of the damage:
https://drive.google.com/drive/folders/10Y0Vd4UeApJiHuwGh70qf71cgymKHYNH?usp=sharing

Thanks in advance for your help!

Just to start with i'd probably take the tail cap apart and give the switch a good wash in methylated spirits or isopropyl alcohol, and while that's washed and nice take some of the alcohol and rub all of the contact surfaces until they're all clean.

Use a paper clip as a switch, if it work, buy a new switch.(inside of the tail cap)