Bent warped bed under the glass

[magnets99]

Hi All, I need to replace my PEI sheet which sits on glass which sits on a heated bed.
it has annoying metal tabs which either hold the plate firm or lets the sheet sit flat (not both!)

So i've bought a kit with a magnetic sticky sheet and some pei sheets sandwiched between sprung steel
(this link, i chose the second one, with base)

Problem is, the heated metal bed under the base is visibly warped
Here is the map

Screenshot taken after removing the glass then doing a bed level compensation.

And you can see in the picture it bows in the middle under the straight edge

my thoughts are:

1. take the bed off and try and bend it flat, i'm not sure if i'm skilled enough or if i need special equipment.
2. stick the magnetic sheet to the glass, this has the disadvantage of keeping the metal tabs, longer bed heat times and there is still a gap under the glass meaning uneven heating.

I have tried:

heating the bed up in case it was just contraction causing it to bow.

Any advice on what i should do here?

[martinv]

@magnets99 In my experience, trying to correct for errors in "the foundation" by fiddling with the layers on top never really results in a great outcome. It may be ... passable, but I suppose it depends what you're aiming for in terms of result. I have had better success in accepting that, in this case, the heating bed is warped, and source/build a new one. That bed looks kind of thin anyway? Depending on where you are, you might be able to get a replacement for not too much. I was looking at the RatRig website a while back and their beds aren't so expensive, though you will need to buy a new heating pad too, alas.

I have those Energetic PEI print sheets on a number of printers and am very happy with them BTW. Also, I was not at all looking forward to the very much one time only job of sticking the magnetic sheet to a print bed, but it actually wasn't as difficult as I thought it would be.

[magnets99]

thanks, i can't seem to find my plate for replacement.
I can find lots of the heating PCB but not the actual metal plate.
I've tried
bed plate
plate
heated plate
ultimaker 2
and HB13 which is silk-screened on the pcb heater underneath the plate
any ideas?

i'm in australia