Skoda Yeti DSG 1.4 150 4x4 2017, Strange electrical burning smell after 35k service

Took the car in for service on Thursday where they replaced the plugs, changed oil in engine, gearbox and Haldex. Then just regular checks and replaced the pollen filter. Now the car smells like burning  bakelite (circuit board) under the bonnet, more towards the left side (looking from the front). Took it back on Friday and they could not find the source, but were adamant that it could not be related to the service done. No smell before the service though. Taking it back on Monday as the smell is still there after driving around 300 miles during the weekend. Any ideas? Could they have damaged any coil packs?