yeah kevin i know about going in after the customer has already attempted to repair a problem, it is surely a headache having to figure out what they botched up and fix that and THEN try and make a diagnosis of the origional problem. I have a customer that does that to me now on a consistant basis... THEN they want to complain about the cost of the repairs after the fact.
I try and explain to them what is happening and they turn a deaf ear to the part about thier tech's botching up the thing before i get to it... its really tough to deal with sometimes.

and bb... flash fires under the hood are no fun, i agree on that... i had a truck do that to me once... cinged my eyebrows and beard when it flashed.. scared the crap outta me too ;o)
So yes, safety is a key factor when dealing with LP systems and also working with flamable sprays etc like electric cleaner and the like. I remember 2 distinct incidents on trucks i was working on... first one was an electric truck, was coding out and i had cleaned the contactors with contact cleaner. I made the mistake of putting the cover back on the rear panel. As soon as i plugged the truck it flashed and blew the rear cover off the truck. Nobody was hurt but it did get the attention of most of the people in the plant lol. An eye opening experience i tell you ;o)
the second incident was cleaning off the engine on an old hyster truck in a cotton mill... i used brakecleaner (big mistake) and didn't get all the cotton off the engine. As soon as i started it the ignition wires arc'd against the engine somewhere and POOF! instant flash fire! man that was scary and the mess from the fire extinguisher was aweful :o/
Was lucky though and it didn't burn up the truck but i certainly learned a lesson there also. DOH!

i guess we all have war stories to tell and the mistakes we've made in the past hehe :o)