Be very careful
Right at the start of the A320's commercial service I was called to an aircraft with multiple failures, these included no squib test, cabin over pressure safety valve open, fire bottle discharge and a number of others I can't remember.
In the end and after about three days in the hangar all the problems had one cause, some fluid had ( I suspect a drink spilled in the cabin) leaked into an electrical connection ( D type plug ) positioned below the cabin floor just above the fwd cargo door.
Some in the hangar offered the opinion that the fire bottle indications result from the problems in the plug but being a cautious type I removed the offending fire bottle and weighed it............ It was empty !