I've decoded all RPO's but the following six using several resources (dealer and web bases tools). Can anybody shed light on these?

AXP
RYJ
R9U
6GK
7GK
SCM


thx in advance
-brad

(these are for 03' 2500 4x2 burb)

not sure what the last three items below mean, but i did find these except for the SCM code:

AXP MPV VIN IDENTIFICATION
RYJ RETRACTABLE CARGO AREA COVER
6GK SPRING COMPTR SELECT FRT LH
7GK SPRING COMPTR SELECT FRT RH
R9U CONTROL SALES ITEM #95

-brad