DDEC codes can only be cleared with A Pro Link or DDDL software.
Code 58 is a cruise control code.
I'd check the two 30 pin connectors at the DDEC ECM (computer) also.
Shut off the batterys, disconnect the two 30 pin connectors, make sure connectors are clean. look at ECM - make sure none of the pins are bent also. Reconnect and secure the two 30 pin connectors.
You should be able to unscrew the ring on the ATEC connector at the trans.
Make sure all is clean, no bent pins.
I agree with JR, codes are most likely old - historic, (inactive).
You need to have them cleared to know what's going on now.
Good luck with your repairs.