Trane XL-1200 Air Conditioner Cover Rattles

Can somebody please tell me how to unsnap the air conditioner outside unit cover. It has a rattle and seems to squeak when I press on it.
When the unit is running I can press down on one corner and the rattling sound stops.
I feel if I could get the cover release I could figure a way to make it snap or hole down tighter. I good at things like that but I can't find a release for the cover. The unit is fine other than this one problem.
Thanks in advance for any help or suggestions.
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