I don't know man might just be normal transmission noise, maybe you're just being to pedantic. You say the synchros have been changed, was the noise there before that?
depending on how busy mabey 30 minutes from walk in to walk out, the actual job itself only takes like 5 minutes depending on how your cluster works, analogue takes a little more mucking around,...
Does the ecu only store the codes for a certain period of time? I thought the codes stay there until you clear them manually?
I'd say o2 sensor starting to go as well, have you noticed higher fuel...
Haven't read the replies in this thread but use some hi-temp goo on the backing plate, that's where most of your brake squeel comes from, its the pad vibrating against the piston at high frequency,...
Make sure the garage used honda cvt oil. Make sure they actually calibrated the trans afterwards. fuk mechanics cant trust them, just do it your self at least you know whats been done