Lizem,
No need to remove the pushbuttons.... Just take the two screws out of the bottom of the wood cover. remove the cover. take out the two screws holding in the ccu. unplug the two connectors from the ccu. remove the "two" screws from the bottom of the ccu,, and your in..... Ahhh. i prefer to use a desolidering tool $9.00 at radio shack to remove the old solider. then take a regular old iron and fill in the blanks. Neatness counts! just try the pushbutton connections first. I was amazed how fast I was up and running.
Good Luck!
Adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320