[Sirrotica]

Former fork lift tech here, DO NOT HEAT THEM, you will weaken them for sure because of the heat treat. You'll have to bend them cold such as on a press, but they will still not have the same strength as they did before they were bent.

Ideally if someone such as myself would inspect the truck the bent fork would be condemned until it was replaced. Straightening them isn't considered as a proper repair because the units safe lifting capacity would be compromised, thus compromising safety, leaving a liability.

In the real world things sometimes fall outside of the ideal circumstances, and people elect to save money and open themselves to a bit of increased liability after weighing out the probability of all factors. I can't say I haven't done this myself.