Just got back from my local MB dealer with the repair estimate for my '98 C230. I need help determining if these are reasonable diagnoses and repair estimates....

Problem: 'Check Engine' light on (most of the time)
Diagnosis: Replace Mass Air Flow Sensor
Cost: $587 P&L
Comment: Checked gas cap before going to shop; Light was NOT on upon return from shop

Problem: Fuel gauge indicated full after filling tank; on next use it indicated empty; next time full again. This happened once before several months back
Diagnosis: Replace both fuel level sensors
Cost: $643 P&L
Comment: My initial guess was that these first two issues were related

Problem: Trunk release switch on center console is broken
Diagnosis: Replace entire console switch panel
Cost: $547 P&L
Comment: Plastic switch cover has detached from the switch. Switch will work with cover in place and a deft touch when operating it (several trys usually req'd.)