TM  11-5820-890-20-2 2-91 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 27 NO RT-A MODULATION FROM COMMANDER'S C 2298. (Sheet 7 of 14) 1.   REMOVE RT's. 2.   REMOVE VAA FROM MB. 3.   CHECK CONTINUITY AT MB J3, PIN U TO J5, PIN M. CHECK CONTINUITY AT VAA P1, PIN M TO J5, PIN D. NO YES OPEN ? REPLACE VAA. NO YES OPEN ? REPLACE MB. REPLACE CX 13300. 10 SH 7 A D B C E F K S U T L H M V R P VAA P1 N J J H P K S R N M L F E D B A C V U T MB J5 V U T S R P N M L K J H F E D C B A MB J3 F E D C B A VAA J5