2001 Boxster Coolant Leak

[The Sandman]

Greetings:
I recently purchased my first Porsche, a 2001 Boxster with 120k miles. Previous owner replaced IMS, RMS, water pump, clutch, spark plugs and coils very recently.

I have noticed a robust leak of pink coolant out of the overflow tank hose once the car warms up, confirmed by placing the back of the car on a ramp and observing fluid coming from the lumen of the tube. I have driven the car around 600 miles or so since purchasing, and have not noticed a "low coolant" light. There is no visible leak around the water pump, hoses, or thermostat housing.

The heater works as it should, and the car does not overheat, which leads me to believe that both the water pump and thermostat are functional. There is no white smoke from exhaust and no unusual color (white/creamy) on the oil dipstick.

There is a -04 series radiator cap installed, a dry trunk, no corrosion in the bottom of the trunk, no wet area on rug, and no corrosion around the bleeder valve bolts.

Nevertheless, I attempted to manually raise the bleeder valve with the small metal tab on top, which promptly came off in my hands. It appears that there is wear around the rubber where the metal tab sits on the bleeder valve, and I am uncertain whether this valve is working at all.

I was going to replace the radiator cap (despite being an -04) and the bleeder valve with a genuine Porsche part (around $85 or so, as the aftermarket parts have not gotten the greatest reviews).

Notably, if I remove the radiator cap while the engine is warm, I don't get the sense that there is any pressure/steam/etc. escaping from the overflow tank. I wonder if the hoses were ever removed from the tank (it doesn't look old/yellowed), and if so, were placed back on the right nozzles?

What else might I be missing? The coolant system seems to be unique on Porsches (i.e. I'm just getting used to it). I have done quite a bit of work on other cars, including Alfas, Maseratis, Cadillacs, Mercedes, etc., so I am rather handy. Before I start throwing $$$ at head gaskets, etc., was curious what others more experienced with these cars might think.

Any help appreciated.

Best
Dave