How do you change trans control module on Mercedes c240?

TCU is probably in trans pan, read this first!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Hi All Y'All - My 98 ML locked up in limp mode about 2 weeks or so ago and refused to get out of it. I took it into a local indie shop who specializes in MB, and a computer readout from his shop said the following:

ME2

Active Faults

01 > P0700: Transm.Contr.System, Malfunction

ETC 6 (Electronic Transmission Control 6)

01 > 41 CAN-Communication with transfer case control module faulty

02 > 134 Intermittent CAN-Communication ESP distorted

03 > 135 Intermittent CAN-Communication ME distorted

04 > 137 Intermittent CAN-Communication with transfer case module faulty

Traction Systems

Active Faults

01 > C1022: CAN communication with engine control module (ME-SFI)(N3/10) interrupted

02 > C1030: CAN communication interrupted with VGN78

IC (Instrument Cluster)

Active Faults

01 > B1040: CAN communication fault to engine control module

02 > B1041: CAN communication fault to traction systems control module

03 > B1470: Fuel level sensor (B4)

04 > B1089 CAN communication fault to transfer case module

----------------------------------------------

The computer that this shop uses is PC Retriever system. Here's what got fixed in the ML:

Replaced the complete valve body with a rebuilt valve body - $ 659

Replaced pan gasket - $ 17

Replaced Transmission case control module - $316

Labor - 4 hrs - $ 350

Transmission Fluid - $ 120

Total: $ 1462

------------------------------------------------

Result: Smooth shifting transmission, no problems with transmission.

Is everything else okay? *NO* As I left the shop, I heard the familiar fuel pump whistling. I've to retrieve my records to see what was upgraded a few years ago -- there was a tech bulleting by MB to repair/replace some or all components of the fuel pump/fuel filter/fuel lines, and I had the work done by the local MB dealer, but don't recall what had been done.

The "low range" light still blinks when I start the car. I do not need to use the low-range for anything at all. However, the indie tells me that the transfer case motor and sensor should be replaced, because even if I don't use the low range, the computer will think there's a problem and lock the ML again in limp mode.

Is the belt-tensioner pulley a known or common problem? On occasion it screeches for a few seconds like two cats in a fight, and most of the time there is absolutely no indication that there's anything wrong!

If any of you have any thoughts, suggestions, opinions on the above, please do share - I love the way the ML drives, but am beginning to tire of the expenses for ongoing maintenance and unpredictability.