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If the bleeder valve is leaking(loosing pressure) it is easy to observe. Once the car is warmed up,it will hiss. If in doubt, temporarily plug the drain port (rearmost of the 3) and look for coolant accumulating after one(not 2!) drives. Then remove the plug.
Replace the old coolant fill cap anyway.
If you decide to replace the coolant reservoir, suggest you ask for guidance here. Cheap(leaky/defective) Chinese tanks on EBay and elsewhere.Need Mayhew cats-paw pliers for the hose clamps.
I hope this is helpful
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