I've not heard of a warranty offer and even if there had been one, as the twin drain was introduced somewhere in MY14 production I couldn't envisage that LR would still be providing the fix under warranty.
Before you go down that path you might want to look at the simple vacuum pump modification described on fullfatrr.com that might resolve smoke issues.  The modification bleeds some oil pressure provided for the pump shaft into the inlet side of the scavenger section to ensure that the suction side is lubricated sufficiently.
I'll find the thread then provide the link.
fullfatrr.com - View topic - Smoke screen fix by scavange pump modification
				
			 
			
		 
			
				
			
			
				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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