Replaced an AC1Plus with an AC1 and the reader pattern is incorrect
The AC1/AC1A module only has 1 LED pattern which is Alternate LED pattern, there is no way to alter this.
See http://buildingskb.schneider-electric.com/view.php?AID=2860 for description of LED patterns
If a different LED pattern is required by the site then use an AC1 plus or an ACX57xx which gives the ability to use an alternate LED pattern. See Lessons Learned Article #2860 for configuration.