R230 2005 ABC suspension no longer sinks

Hello SL friends, have brought my SL 500, BJ2005, 207,000km in a free workshop to change the brake discs and linings in front. The workshop puts it up. Drives onto the stage. Switches the windows and coverings. Everything is normal. Stage down. The chassis no longer sinks. The pump/pressure tank is now 1 1/2 years in it. Newly bought and installed at MB. Does anyone have an idea? Until yesterday the Fzg has driven perfectly. No problems. Who pays the additional expenses for the Suc When someone has an idea. Please report. Thank you SL sneezeser