Introduction
Follow these steps to disassemble the plastic casing of the RIDGID R84015 X2 power drill.
Tools
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            Remove the backplate. 
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            Using a Torx T20 screwdriver, remove the four screws attaching the back plate. 
 
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            Remove the drill handle. 
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            Using the Phillips #2 screwdriver, remove the five screws attaching the drill handle to the body. 
 
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            Remove the gear casing from the body. 
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            Using the Philips #2 screwdriver, remove the four screws attaching the gear casing to the body. 
 
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            Check to see that the forward reverse switch isn't broken. 
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            NOTE: small tab on trigger fits into groove on forward reverse switch 
 
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            With the battery attached, check that the wires work when the trigger is pulled. 
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            Put multimeter wires here. 
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            If wires work and drill doesn't, the problem is with the motor. 
 
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One comment
I was able to diagnose and fix my problem with my black and decker following your instructions. TY