1) what make is the HU
2) how old is it
3) go on-line, call the folk who make it, speak to them, try and get a very rough quote
4) check specs of something equivalent now
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-compare between quote
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+ postage costs
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+ hassle
5) just buy a new one of costs don't stack up, cheap HU's do more than expensive ones used to
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(check connections are the same)
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.
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.
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.simples!