DE Time Machine: ramp warped

I just picked up a Data East Time Machine and the upper left hand corner ramp assembly is warped. The bottom of the dual ramps where the ball travels is badly bowed up in the middle instead of being flat. The center portion of this assembly is warped too. The seller indicated that the machine has been indoors for years and not exposed to high heat. What could have caused his? Do you think that there is any chance of flattening this assembly with a heat gun perhaps pressing down with a few blocks of wood?

I've looked for a replacement without success.

Thanks ,Alan

Tacos, thanks for the reply. I agree that excessive heat must have caused this condition, like sitting in the sun every day. But neither the playfield, cab or head are faded. I guess that I should be happy for small favors. Both the upper left and right had ramp assemblies as well as the lower right pass through have this condition from end to end. The guy at Starship Fantasy says that although he has flame polished thousands of ramps, he wouldn't try to straighten these.

What do you think of this? What if I went to a metal shop and asked them to see if they could duplicate these pieces in stainless steel, or with metal habitrails? I mean, the machine is a boat anchor right now and I'm not parting it out! Yeah, it could cost hundreds, but I would have spent hundreds for new ramps anyhow.

Alan