Updates added below
NavyRecognition is reporting that the Philippines has awarded a PHP1.5 billion ($28.6M) contract to a South Korean firm for upgrades to their Del Pilar Class Frigates. These are the former cutters Hamilton, Boutwell, and Dallas.
“The project has an approved budget of PHP1.5 billion which will be sourced from the Armed Forces of the Philippine Modernization Trust Fund. The upgrade seeks to enhance the ships’ combat management systems, electronic support and sonar capability to make it capable of operating with incoming and more modern naval assets like the two Jose Rizal-class missile frigates being completed by Hyundai Heavy Industries in South Korea.”
The AN/SPS-40 air search radar, SLQ-32 Electronic Warfare System, 25 mm Mk38 guns, and the Phalanx CIWS were removed before the vessels were transferred to the Philippines.
Presumably in addition to sonar, this upgrade will include torpedo tubes and Korean manufactured torpedoes (Update: apparently not–not included in this contract). The EW system will likely also include countermeasures. An air search capable radar like the Hensoldt TRS-3D Baseline D multi-mode phased array C-band radar being installed on the Jose Rizal-class frigates, to replace the AN/SPS-40 will almost certainly be included (Update: Sea Giraffe multi-role radar had been purchased from the US for this purpose, this is the same radar being purchased for the OPCs). Provision for anti-ship cruise missiles is a possibility, but at this point the full extent of modernization is not clear. I would assume the former WHECs will share some systems with the new frigates.