What I did with PB Blaster when I was pulling my motor was hit the problem bolts and let them soak for a couple days. I had time till the motor was coming out so I'd hit them once or twice a day for a couple days. When I finally got to pulling the motor the bolts came loose with no problems.
Not sure if that advice helps with seized bolts, but if you have time to wait then it certainly won't hurt anything.
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