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If I read this right, it's engines older than this month!
Perry, I'm thinking it pertains to engine built prior to 14 Jan 2019. Check with UL to be sure?
The UL Ser # is yr/wk/seq
So 191401 is the 1st engine built the 14th week of 2019.
Thanks Perry, that use to be in the installation manual...couldn't find it in the recent online versions of the install, maintenance or operating manual. Thanks! BTW, I have 110111