If the Inspection Cartridge in the Advance Termite Bait Station is empty upon inspection that means that termites have eaten the entire contents of the cartridge and it was not monitored frequently enough to catch the activity and replace with a bait cartridge to kill them off. The stations should be checked quarterly for any activity.
You should clean out all of the Advance Termite Bait Stations completely and replace the wood base at least every 12 months, or once a year. Depending on where you live and the climate and amount of rain, you may need to replace the wood base more often. If the wood bases become very soggy and moldy then you should replace them. It sounds like the bait may need to be replaced all together and the station wiped out. We are not aware of a specific product used for this.
Yes and No. It depends on what kind of mold it is. The company that makes the Advanced Termite Bait System has put out a training guide for quality assurance that addresses when you should replace the wood or cartridges based on what they look like and what color the mold or fungus is. From the guide: In general, replace the TIC if the tablets have:
•Pink mold present
•Veins of pink run throughout the TIC
•Tablets appears to be slimy or glistening like gelatin
•It has been in the ground for 15 months
Do not replace TICs if the tablets:
•Appear to be swollen or enlarged
•Have black or green colored mold on their surfaces
Here is a link to the guide for you to read further: http://www.domyownpestcontrol.com/msds/advance-termite-bait-system-quality-assurance-brochure-opt.pdf