Well I'm not 100% certain of what you are trying to accomplish. Your thread title states that you would like a cell value added to the subject line, while you narrative description states that you would like the Subject to be "Maintenance Alert!". Some clarification would be welcome.
As to the code included in your attached workbook, you are currently attempting to pass a range value (expressed as Range("whatever").Value) to a declared String variable. In order for this to work you need to remove the .Value. If it is your wish to include more than one Engine (and admittedly I cannot discern what constitutes a trigger), it could look something like this:
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