Here's a direct link to the PDF that described the IR signal:
[Link: leviton.com]

Here is the data contained in the doc...

TIMING
Frequency = 38 KHz

"1" - 4 msec
500 usec = Tx Time
3500 usec = Pause

"0" - 2 msec
500 usec = Tx Time
1500 usec = Pause

Start Code 6 msec
500 usec = Tx Time
5500 usec = Pause

COMMAND CODES
Scene 1 Sequence
00000000 11101000
Scene 2 Sequence
00000000 00011000
Scene 3 Sequence
00000000 10011000
Scene 4 Sequence
00000000 01011000
Scene 5 Sequence
00000000 11100100
Scene 6 Sequence
00000000 00010100
Scene 7 Sequence
00000000 10010100
Scene 8 Sequence
00000000 01010100
MAX
00000000 11010000
DIM
00000000 10110000
BRIGHT
00000000 00110000
OFF
00000000 01100000