Determining which plugin is catching a command?

Hi folks,
I have a deceptively simple and overly broad question. Is there any
reasonably way within vim to determine what plugin is attempting to
respond to a given command? The use case I have here is that I have
installed Tim Pope's excellent surround plugin, which I haven't used
for a while, and apparently something I have installed in the interim
is catching the keys that are bound to surround. In other words,
surround used to work, it doesn't anymore, and I am sure it is the
fault of one of the far too many plugins I have installed since. Is
there an easy way to, say, gather some sort of debug data about which
plugin is catching what keystrokes?

Thanks in advance,
-- Steen

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