On arrival remove old pc board and install the replacement pc board. I checked all electrical wire to make sure. Everything is hooked up correctly. Called for heating Unit went into s 20min delay. And then ran normally. Customer paid balance and signed but refuse to sign the last signature. Because of system flashing multiple communication lights. Green, blue, red, yellow. Spoke to co worker Collins about light on both pc board. They are communicating lights. System running normal dealt T 130 return 72