1. Open up the vehicle you want (
Example MAA here)
2. CTRL+F Regeneration and MaxHealth. This will help you find the regeneration delay, regeneration rate, and health values. In the MAA's case, the vehicle's HP is out of 1000, regeneration begins after a 14s delay, and increases raw HP by 10 (or 1%) every second
3. Maintenance is located at line 9111. The Data Browser does not include the Persistence folder usually so you'll have to either extract it yourself or request a full one from someone who has it. The AavRegenUpgrade has a 0.7x delay modifier and 1.2x regeneration rate modifier. This makes the delay 9.8s and rate 12 HP per second