code 23 - fwd or rev coil current low when it should be high

is it showing code 23 in one or both directions?
unplug the B plug and plug it back in
does it work then?

also check the ohmic value from PB4 to the positive side of the FWD coil should be 10-14 ohms
check for the same thing from PB5 to the REV coil

also do the same check for 1A RB SP or FW coils from the B plug
PB6- 1A
PB2- RB
PB3- SP
PB1- FW

try unplugging the plugs on the card clean them with nonconductive electronics cleaner then you should lubricate the pins (in the plug side only) with a special lube

GE has a kit for this
328AXXXXG001 (this should cross in most x-ref's it does in mitsu)

this contains
Cleaner - Chemtronics Pow-R-WasH CZ Contact
Cleaner
Lubricant - Nye Lubricants NYOGEL 760G

id get the nyogel its not that expensive
but the cleaner in the kit is like 50 bucks for a 12oz can
i use stuff from grainger that works pretty good (thats safe on plastic)

any plugs you come across that are dry (all ev100 plugs, sx controls 23 and 12 pin etc) you should clean and lube
it can head off some annoying issues
i charge a small fee to service the plugs especially when they are the cause of a breakdown (which happens often enough)