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Since he posted that the motor was straining to get the window up, I assumed he was correct that it may be the regulator or motor. If the switch goes bad, it just "stops" working, not straining the motor.
If the switch is at fault, you can try pulling up on the window switch in question just a little harder than normal, and also pushing slightly left or right. If it tries to operate the window, you have a bad switch, but you also need to find out why the window motor is straining to get the window up. The excess current draw can ruin the switch assembly. On warranty window switch replacements, MB now makes us write down the current draw for the affected window for up and down operations.
Gilly
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