I assume that the coils probably had burned before the SDB was replaced. Should be safe to replace the coils....I would advise to check the pop switch to make sure that it won't cause the pop bumper to lock on. Make sure any protection diodes across the new coils are oriented correctly, and either purchase coils with diodes already installed or just install new ones, don't take a chance with reusing the old diodes. Finally, when powering up watch carefully to make sure no coils stick on - shut it down quickly if anything does.

I would disconnect the obvious burnt coils , put an ohm meter on them to see if shorted (probably burned open?)

Check the fuse under the playfield for proper value, looks like schematic says 1-Amp slo-blo

How is it cooked if it looks brand new?

Probably took out the driver on the old SDB.

Had pretty much the same situation with a Stingray I just picked up has both Alltek boards installed dead pop bumper and trough kick out coil but the game would power on with no problems pop coil was melted and kick out was toasty replaced both with new coils/diodes and all good now.

Normally the playfield 1A SB fuse would have blown before all those coils cooked. MH was made before the playfield fuse was added. A service bulletin went out advising to modify the coil wiring with a fuse to protect the transistors from being cooked. You may want to consider making that mod to protect your boards in the future.

chicken or the egg

did the transistor short and cook the coil or did the diode on the coil go short and cook the transistor?

My Mata Hari has the playfield coil fuse by the flippers and was seemingly built that way in the factory.

What should be fused and is not is the chime box. You get bonus points for fusing that.... the knocker too...

I have had a few Mati Hari's, including it being the first game I ever owned. When I was in the biz I never got one in that didn't have a fuse under the playfield. Maybe an early production thing?

My Mata Hari has a factory fuse holder under the playfield too. It is a flimsy design and should be replaced w/a sturdier one.