MTS DOES NOT ENDORSE THE ABOVE LINKS, ANGELFIRE ADDED THIS
ICOM 730/740

• Poor Preamp relay, Lower Receive with preamp on
  • Preamp relay has tarnished contacts. You can replace the relay (every other year) or do this mod. 730, 740, (Most of the 740's have been updated by the factory)
    
• Warc Band Update. This info is in the Instruction Manual, someplace and the service manual on page 4-2 (for the 730). Here are the methods. 740 WARC, 730 WARC
  
• The 740 uses the same plastic trimmer caps but doesn't suffer from the premature failure. (usually)
  
• 740 Compressor switch failure (Tx power drops with compessor off or on)
  • The switch routes the I.F. for transmitt. No DC through the switch, so it tarnishes (yes this is a common theme)(the 740 uses IF compression, nice feature). It is simple to fix. Use this update 740