RADAR SYSTEM FROM PRIMUS 870 TO PRIMUS 880. REMOVED THEl 1 & 2 WC-870 CONTROLLERS P/N 7008471-803 AND INSTALLED WC-880 CONTROLLERS P/N 7008471-405 (TSO C63c), REMOVED THE WU-870 ANTENNA & RECEIVER / TRANSMITTER UNIT P/N 7012640-902 AND INSTALLED NEW WU- 880 ANTENNA & RECEIVER / TRANSMITTER UNIT P/N 702145