slow attitude indicator

[fredh]

I have a de-iced 73 P model and have a slow to spool up attitude indicator. Looking through the service manual it seems the de-iced versions vacuum system is different from the non de-iced a/c , I was thinking maybe I have a plugged or restricted vacuum filter but can't find it and am thinking it may not have an inline filter. I found both garter filters but no inline filter. Thanks in advance for the assistance.
Fred II