Yes, Crossfire is still around. However, they have been working on a large government contract the past few months.
To drain the tank, you can disconnect the air line that feeds your marker's regulator (or gas through foregrip). Once the line is disconnected, go ahead and screw the tank into the marker's ASA. If it is an on/off ASA, turn it on.
For the chip, it sounds like it is repairable. If you can get ahold of Crossfire, they could do the hydro test and repair at the same time. I also know that Ninja can also perform the same thing (fix and hydro).
Graphite Dangerous Power REV-I
– TechT bolt engine, REV-I & Disruptive barrel kits, Prophecy V2 w/ Empire feedgate, Crossfire SS 68/4500
Maroon and Polished Aluminum Dangerous Power Threshold
– 7th Element board, TechT bolt engine, magnet trigger kit, REV-I PMD, Sly Dual Carbon barrel kit, Prophecy V2, Crossfire SS 68/4500
Black and Silver Dangerous Power F8
– APE Rampage board, VS bolt, magnet trigger kit, F8 gauge, REDZ barrel kit, Halo B w/ Exalt feedgate, PMI 68/4500
Polished Aluminum and Red Dangerous Power F8
– Virtue board, VS bolt, magnet trigger kit, Halo B w/ Exalt feedgate, PMI 68/4500