A common fault with the push button systern. The two screws that fix the systern to the pan leak, remove the systern undo the nuts from the underneath, wind some PTFE tape around the thread close to the systern, then screw the nuts back up, this will make a seal from the threaded screws to the systern.
I have cured this many, many times, the water finds its way down the threads, flushing will not cure it.
Norman Watts
September 2007