Trimble 36576-A should be a Trimble Ace or Ace II board (~ $18 on eBay). ALL have WNRO issue ! Heol Designs (France) replacements https://www.heoldesign.com/N01x-Trimble-Lassen-SK2-iQ-sQ-LP-ACE-replacements-boards w9gb Chicago Sent from iPhone 6s