Waters Xevo TQ MS Operator's, Overview And Maintenance Manual page 167

Replacing the APCI probe heater
To avoid damaging the probe heater's electrical wiring,
Caution:
take great care when removing the probe heater cover or while
the probe heater is exposed.
3. Carefully pull the probe heater cover off the probe.
Probe heater electrical wiring
Probe heater
February 11, 2013, 71500130002 Rev. D 167