If you start putting the rails on it etc it may start to correct itself out.

I always put two 2 by 2 wood that is very flat and put on the back side of PF with a few screws too hold them on there too help too get the bend too go the other way and sometimes over time it does help

Looks warped, but laying it on carpet doesn't work. Lay it on a tile floor or lay a 4' level down the length. Adding side rails will usually straighten minor warping and then when the components are added, their weight will usually will fix it.

I had a Xenon NOS PF warped 1" from corner to corner. After adding rails and letting it sit awhile it was straight.

Is this something you are going to use? I assume so. Do you have access to a table saw? What I do is make new rails out of oak and spray paint those in black oil-based spray paint. Use your old playfield to get all the needed lengths. Sometimes Home Depot actually carries 1/2" oak which is exactly what you need. Other times you'll need to buy thinker and cut it down. The OEM rails are crappy pine with a black decal. The replacements are nice hardwood that will straighten your playfield out in no time.

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Any update on what u have done so far too help your PF