What was found
DURING CLIMB THROUGH FL340 A BURNING ELECTRICAL SMELL WAS NOTICED. AFTER A FEW MINUTES MUTIPLE EICAS MESSAGES ILLUMINATED. NR 1 RADIO ON BOTH GIA'S FAILED A/P FAILED YAW DAMP FAILED & SEVERAL OTHER SYS. NR 2 RADIO WAS TRANSMITTING VERY WEAK AND AT TIMES OTHER ACFT WERE THE ONLY ONES THAT COULD HEAR US TRANSMITTING. REMOVED DUE TO BURNING SMELL COMING OFF GIA63W WITH ASSOCIATED GIA 1 COMM AND AP CAS MESSAGES. REPLACED WITH PN SN MENTIONED ABOVE. OPS CHECK GOOD. ALL OPTIONS AND BASE CONFIGURATION LOADED FOR GIA 1. WORK DONE IAW MM 31-41-05.