What was found
UPON STARTING APU AFTER LANDING, RT FWD WINDOW, EICAS MESSAGE. FOLLOWED FAULT CODE 30901442. RE-RACKED WINDOW HEAT CONTROL UNIT & BITE TEST THE UNIT THEN CHECKED OK IAW AMM 30-41-01-404-007. PERFORMED OPERATION TEST OF FLT COMP WINDOW ANTI-ICING SYS & CHECKED OK IAW AMM 30-41-00, MESSAGE GONE, ACFT OK FOR SERVICE.