OK the mic doesn't work but what part of it? There are two types, the plain Jane European model and the US one with a DTMF keypad. Since repeater autopatch has gone the way of the dinosaurs you don't need it anyway, if the PTT doesn't work you have a wire broken usually at the connector or where the cord enters the mic body, both flex points. If there is no audio again a broken wire or the electret element went south, it can be replaced with any junk box electret that will fit.
What do you mean the PL codes don't match? I don't remember how they're displayed but the chart may be found on page 8. Pay particular attention to the note at the bottom and procedure on page 9. If you can count you can enter the correct code.
As an aside, too bad Azden stopped manufacture and service of Amateur transceivers years ago to concentrate on broadcast equipment, none of which I have ever seen. I used to know Lou (SK) owner of the Long Island NY service center and member of LIMARC, one heck of a great guy. My first 2M rig is the PCS-7000H (the last model they made) going strong in almost continuous packet radio service since 1995. How's THAT for reliability?