Is there a filter that I can clean out located behind the round cover on the lower right front of my Bosch Nexxt 500 series washer?  If so, how do I get the cover off?

Check the pump filter. This is located at the bottom front right of washer. Look for a drop down flap or cover, once located, unscrew filter anti-clockwise to remove and clean. Be prepared for a lot of water and junk. If you find a closed hose pipe when you remove the drop down flap it is to drain excess water.
The pump itself is directly behind the filter housing, check if there is nothing stuck in the housing, especially after you are cleaning out your filter after a long time. Clean out and refit carefully
Pl click if helped.

The filter should be located at the bottom front right of the washer.
It may be behind a removeable plastic cover at the bottom of the washer.
Unscrew anti-clockwise to remove and clean.

It attaches to a pull strap. The pull strap is in case the switch fails it can be pulled to get the door open. Most bosch pull straps are located behind the drain filter cover (lower right).

You need to check and clean the pump filter if you have not already done so.
This is located at the bottom front right of washer.
Unscrew anti-clockwise to remove and clean.

Sounds like the filter needs to be cleaned
This is located at the bottom front right of washer behind drop down cover or flap.
Unscrew anti-clockwise to remove and clean.

You first of all need to check the pump filter.
This should be located at the botom front right of washer.
Look for a drop down flap or cover, once located, unscrew filter anti-clockwise to remove and clean.

The pump itself is directly behind the filter housing, check there is nothing stuck in the housing.
This should solve the prob.
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Thankyou.

You need to clean the filter.
This is usually located at the bottom right front of washer, behind a drop down cover, or removeable plastic trim.
Unscew anti-clockwise to remove and clean.
Hope this helps.

It does sound like the problem is related to the water pump.
The filter should be located at the bottom front right of washer, sometimes behind a removeable cover.
Locate filter, and remove by turning anti-clockwise, and clean, check inside the filter housing for anything in there as well.
Hope this helps.

I solved the problem by using a sump pump to drain most of the water, then I removed the cover plate on the lower front right of the machine to get access to the drain plug. Upon removing that, some water flowed out but not too much, I found a sock jammed in there which wasn't allowing the drain or spin cycle to work properly.

Interestingly, the machine's manual says that the cover plate is only to be removed by a Bosch authorized service repair representative. Saved about $150 by simply doing this myself.

Check and clean filter, it is usually located behind a plastic panel at the bottom front of the washer, remove cover and unscrew the filter cover anti clockwise, pull out and clean, replace and test, if it still does not drain, then possibly pump blocked or faulty.
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Thanks.