Is it possible to use the LX Handset to disable the regenerative braking feature on a Clark forklift model ECG32, serial number starting with ECG358?

The reason I ask, in the course of trouble shooting the ECG32, I determined its logic card was in question. After trying everything, (and I mean EVERERYTHING) else, and putting it off as long as I could, I pulled a logic card from a different Clark that was working but mechanical issues. It is a model ECG20, also serial number beginning ECG358.

After doing that, the fault code -27 went away, to be replaced by fault code -72. Researching that -72 educated me about regenerative braking systems and looking closer I found that the ECG20 I borrowed the "working" logic card from has a contactor installed for the RB system, while the ECG32 I'm trying to get working does not. There's a big gaping empty spot where the RB contactor and related components (REC 7 ect.) would go.

So I'm thinking fine, but to prove that it really will work with a good logic card, (a necessary step when working with my company's parts department) can I disable that feature with the handset somehow?

But no, not so far. Working off page 19-05-3 of the manual for ECG20-32 Clarks, I've tried putting function codes U9, U10, U50, U54, U58, and U62 at zero, and at the minimum setting. Neither option changes anything, it still just returns the code -72. One thing I'm thinking about but haven't tried yet, is Function 22. It shows that as performance mode; and gives a setting of 184. Would setting that to zero change anything? Disabling High Performance Mode in it's entirety?

So in a nutshell, am I just totally barking up the wrong tree, and this feature is enabled when they build the card, and there's no turning it off?

Or can Regenerative Braking be turned off, but I just don't know how?

Sorry for the long-winded post, just wanted to include as many relevant details as possible.

As a p.s. If there is a way to bench test a logic card, that would solve my main problem. But everything I read about that says, "no not really," hence the
part-swapping, which I do hate.