Speak to an engineer now!
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The best way to make a decision is with as much solid information as you can get. This is one area where expertise is essential. Talk to as many people with real knowledge as you can. In addition to whomever else you find, might as well talk to us ;) We always try and help, whether you ultimately choose us for the job or not.
Call us on 61 2 9906 7976 in Sydney or 1300 88 31 77 (local call charge anywhere in Australia) and ask to speak to an engineer. If it's something simple, we do try and sort it on the phone (it's less paperwork for us ;-)
Or you could just drop in :) At the very least, we can bring clarity to your situation.