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| Dismantle and assemble auxiliary heater -D3W- → Chapter. |
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| Pull 8-pin connector (T8) off. |
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| Loosen both cross-head screws -2- on combustion air blower cover. |
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| Remove cross head screws -3- and hexagon socket head bolts -4- and -5-. |
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| Lift up heater control unit -J162--1-. |
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| Pull 10-pin connector off. |
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