How to replace a broken inner door glass pane in a Whirlpool range
To disassemble door - first remove the door from oven, open to first stop, the lift upward on door and pull bottom out. Set door down on a blanket etc, remove lower trim and outer glass/side trims and set aside - unscrew hinges from bottom lip and handle/vent. Remove inner reflector panel and insulation, now you can lift out the mid glass and frame to access the inner glass panel retainers.
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Source: Whirlpool GJP84800 Oven will not work. Elements are hidden from view.