speedotron

I've got a vintage '85 Speedotron D402 pack with a couple of 5" reflector heads (sorry, don't recall model#s) that I used up thru 1990 for portraiture. The pack hasn't been powered on since about 1991. Given that there are (presumably large) capacitors in this thing, is there any danger in...

$500 for the set, buyer pays shipping. 1 Speedotron D402p power pack ($630 new) 4 Speedotron M11 Heads ($300 new ... EACH) 2 Speedotron M90 Heads ($250 new EACH) 1 Speedotron M3WU Head ($250 new) 2 Pocketwizard Plus IIIs ($270 for set of 2, new) Everything works. It's about 5 years old, and...