Model: IC-O4AT Bulletin: B2001 Subject: Transmitter delay may be excessive at low temperature (can be up to 2 or 3 seconds). 1. Remove the front and rear covers. 2. Remove the volume and squelch knobs by pulling up on them. Push down the high/low power and lamp switch. Remove the four screws in the metal chassis corners. Unfold the chassis. 3. Replace R262 (currently 560K) with a 2.2 Meg resistor (ICOM P/N 915-01277). 4. Reassemble the radio.