Since I have a pressure tester, as James1549 suggests, I would pressure test the system.
As posted by onehundred80, the easiest start is hose clamps. They do loosen, or hose shrinks?, so sometimes the slightest tightening can solve minor leaks.
A pressure tester would show small leaks, tightening the clamp a bit could fix the leak so start tightening but...usually time for a new hose (don't know mileage or age), either way, we are all probably due for new hoses and clamps.
It is a pressurized system; lot's of other sources for leaks so keep looking
Steve