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If it is the scroll wheel, then it may be like my 201....
The temp scroll wheel includes two pots. When mine has done this (on two separate occasions) it has been that the pots have become desoldered from the board.
A quick resoldering tends to cure this problem. The ACC is not hard to remove on the 201; don't know about the 140.
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Jovan
'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)
'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
'19 Range Rover; 30kmi
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