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if the compressor clutch was engaging then that set of readings means the compressor is dead. the expansion valve is frequently changed out during a compressor switch as I don't think you can flush an A/C system with the valve in place (might be wrong there). the new drier is recommended whenever the system is exposed to air - don't want water vapor inside so it freezes up a passage with an ice blockage. If you can find the means to vacuum down the system after installing the components I would go for a DIY (if comfortable with the idea). I did, and had a certified tech pull the vacuum then add the freon - saved mucho bucks...of course YMMV.
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