Subzero 650 bottom mount No ice

Have a head ache with this one 4 year old subzero .. Customer noticed NO ice but the ice cream is still hard… then sees that the service light is on … resets the service light. by turn it off and then back on again.. Ice maker works again…I check history both box temp and evaporator temp both are good.. customer didn’t think the ICE light was blinking…history show the reset but no other errors…. Any Ideas? the FF evaporator I replace about 2 months ago..it had an ice ball on the cap inlet…but today it had a full evaporator and good pressures .