C25C First Officer reported multiple system failures during departure climb. Flight crew returned to departure airport uneventfully.

Narrative

We were climbing through 33;000 feet with FL450 as final; when we heard the voice announcement LEFT OIL PRESS LOW LEVEL. Both pilots checked the EICAS and found all these messages: BLEED AIR MONITOR FAIL L; WINDSHIELD HEAT FAIL L; PITOT/STATIC COLD STBY; PITOT/STATIC COLD L; AP PITCH TRIM FAIL; RUDDER BIAS FAIL; AC ALTERNATOR FAIL L; SPEED BRAKES FAIL; FLAPS FAIL; PRESSURIZATION CONTROL; PRIMARY ELEVATOR TRIM FIAL.Airplane was fly able and because we had visual conditions we decided to return to land to ZZZ airport; were we departed from company facilities. During descent we had pitch trim runaway; AP failure; CABIN PRESS caution message descending through 18;000 feet; we had to manually extent the landing and land with no flaps nor speed brakes.This situation was accomplished uneventfully because of the visual conditions. On IFC and/or ice formation; the outcome would have been totally different.At Company Center; after a complete evaluation; determined that the problem was a faulty CB. What a dangerous situation for just a tiny peace of metal! Nevertheless; there's a second part of this story. Next will be posted dated Day 0 when they found corrosion inside cockpit of our airplane.