Aneesh,
I suspect you pulled a connector or more loose by removing the case. Check and reseat connectors. This can easily happen removing the case and/or doing any checking without you noticing. A couple of mm movement will disconnect. Dirty switch contacts will cause problems like this.
Having a 2252, the condensers in yours are likely the same in the scope. I did recap mine with NIchicon, ULD, UHE, UCY and LGR. The power supply board is tedious to remove. I did oil the fan with the supply removed. Bad caps will cause problems. If you have any RIFAs in there, replace them on-sight.
Mark
