I have a '92 300SE, and would assume the codes would be very similar since the cars are only 1 year apart.

23 & 94 - show no such code values (as such, the rest may be suspect as well)
87 - intermittent fault with the duovalve unit
88 - A/C Compressor Ground Activation - didn't get much info here. AllData says to test some pins on the left-hand climate control unit connector (inside dash) - should be 9-12v with control set to EC, and <1v with control set to defrost.
14 / 3 - point to problems with the rear A/C control module. (If your car doesn't have rear A/C - as identified by temp-control wheels with an additional fan-speed control in the rear compartment), the I'd ignore all the rest of this.
10 - repeat DTC readout ????
30 - Right heater core temp sensor - open or short circuit (continuous fault)

Don't know if this is much help. You definitely shouldn't see any oily substance on the dryer area - I'd take it back to the folks that did the work.