SINGAPORE -- Southeast Asia's largest lender by assets, DBS Group Holdings, is fighting to demonstrate the results of its digital banking reform after last year's severe disruptions , which drew punishment from Singapore's financial regulator.

"We have focused on improving service availability," CEO Piyush Gupta said during the first-quarter earnings briefing on Thursday. "We have done a lot of the heavy lifting, but in truth, we still have more work to do."