Scirocco Central

Hi , first time of posting but looking for a little help, my 2015 2.0 TDI 184bhp Scirocco has been loosing coolant for quite a while , no puddles of water and no increased operating temperature.
In my mind this was either EGR cooler or head gasket , my mechanic removed and replaced ( whilst there at my instruction )the EGR cooler BUT the problem is higher up the chain , the EGR and DPF were both spotless from there obvious steam cleaning. The problem is obviously the head gasket I would think, strange because vehicle had engine rebuild and new turbo only 18 months ago (5K miles) but coolant loss has been there since rebuild, no white smoke and only the smallest speck of white residue on oil fill cap which I always put down to short trip usage.

Is it possible to change the head gasket in situ or would people advice pulling the engine back out, could the reman turbo be at fault in any way ?, engine was rebuilt very thoroughly at the time , new gasket and stretch bolts, just looking for some guidance please, love the car but need to get to enjoy it, Engine Code is a CUWA.
Thanks for any help and comments.

Best is to put pressure on the system and see if you can spot a leak. Some leaks are hard to find.

After 450.000 km i have had 2 leaking hoses to the heater core and 1 hose rubbed against the ac fan. But that was not installed correctly.

But the head gasket could leak yes. Turbo is only oil cooled i think. Also the coolant bottle cap could be mallfunctioning. If you still can’t find it analyse engine / dsg oil for tracés of coolant.

Thank you Roy , have looked for leaks but nothing , have combustion gases in the coolant so I think it is the head gasket , as I said the DPF and EGR were so clean from being almost steam cleaned every time engine was running .

Just need to know if easier to remove engine totally or try to replace in situ .
It is a 2015 car and I think turbo is water cooled.

You’re right about the turbo.
Maybe the fastest way to ask a mechanic.