I know that deboarding can't be later selected if catering/fuel truck is first selected, but if catering/fuel is indeed called first, the pax stairs at non-gate locations don't get rolled to the main door. I'd suggest that if catering or fuel are called first (as in the case of starting with an empty jet not in need of deboarding) that the pax stairs get rolled up as part of the catering/fuel script when they aren't already pushed up to the jet from deboarding.
Regards
Bob Scott
Colonel, USAF (ret)
ATP IMEL Gulfstream II-III-IV-V
Colorado Springs, CO