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Send it in for a cleaning. Canon will tell you if something is worn past its service life.
If it is your work camera, and you plan to keep hammering the shutter, get it replaced. otherwise, wait until it croaks. MTBF is a statistical yardstick, not a gas tank. For every shutter that dies at 10K, 20K, etc, there is another one to go 500K to balance the equation.
Heck, depending on your luck, you could get it replaced, and 500 clicks later, have it die. Of course, Canon would warranty that, but still, that's the nature of statistics.