After several more tests with a variety of values, I am now 98% certain of the following facts concerning Repairbot stats:
- PAR0 is how many points of damage it heals.
- PAR1 is how many times per second it heals the amount of damage listed in PAR0.
I'm a little less certain of the following (but still 70%+ confident)...
- It seems that whenever the healing triggers, it heals not only hull but also systems damage. So a high PAR1 but low PAR0 results in a ship whose hull hardly repairs at all, but whose systems are restored frequently. That implies that ship's systems have a small number of hitpoints.