I looked up the IR codes for the commands on my AVR-3803 and used a hex converter. The hex code I got seems to be similar to what you wrote:

0000 006D 0000 0020 000A 001E 000A 001E 000A 0046 000A 0046 000A 001E 000A 001E 000A 001E 000A 001E 000A 001E 000A 001E 000A 0046 000A 001E 000A 0046 000A 001E 000A 001E 000A 0679 000A 001E 000A 001E 000A 0046 000A 0046 000A 001E 000A 0046 000A 0046 000A 0046 000A 0046 000A 0046 000A 001E 000A 0046 000A 001E 000A 0046 000A 0046 000A 0679


I emailed Logitech support asking them to add that hex code as a new command to my AVR-3803 in the MyHarmony software. I'll report back on how that goes.