I don't think we should assume that most technology will die off. There are enough people out there with interest in maintaining technology, and their own mechanical skills and equipment (and generators), to keep all but the most complex tech going for a long time.
This includes communications equipment, which can be used to pass along information about maintenance and repair (or, at least, jury-rigging ideas) to others, and to organize sharing and swapping of hardware to keep each other going. At the very least, we can expect ebays and craigslists to continue well into the future.
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