Piper PA-46-350P Malibu Mirage Pilot's Manual And Operation Manual page 242

SECTION 7
DESCR/OPERATION
7.29 VACUUM SYSTEM (Continued)
Upon completion of the flight, all system abnormalities or malfunctions
should be checked by a mechanic, and necessary repairs made, prior to
further pressurized flight or flight under IFR.
Operators of airplanes equipped with wing and tail deicers should refer
to Section 9, Supplement 3, for additional information concerning the
vacuum system.
REPORT: VB-1710
7-56
PA-46-350P, MALIBU
ISSUED: FEBRUARY 23, 1999