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How do I access the dump valve?It's covered by a white plastic bracket?

Have taken the lid off the concealed system to repair the dump valve.I can see the dump valve but it has a securing bracket/cradle over the top & I can't work out how to release the bracket in order to remove the dump valve. Completely perplexed. Can anyone advise how to remove the pesky bracket please?
Ghislaine Williams, September 2013