Am thinking of purchasing a 1999 S70GLT. Very clean 57K miles. Battery was "flat" when I first looked at the car, seller was mystified. When researching this model I saw one reference to an electrical gremlin in which battery drains when some S70's sit for several days. I know they have the usual Volvo electrical/ABS/computer problems but is there a specfic difficult to solve problem with some S70's draining the battery when not driven for several days? Howard