If not already commited to a replacement engine, it might be worthwhile having the inlet manifolds removed and the head bolts re-torqued. Being stretch bolts and if only a very light leak then the cost of retorquing might be worthwhile.  It's what I would do myself but perhaps not not economical paying for a workshop to do the work.
Saab used to have retorquing their stretch head bolts as a service item every 200K kms IIRC but that was without the gasket leaking.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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