According to online posts and workers, Tesla (TSLA.O) Shanghai manufacturing workers are using social media to appeal to Elon Musk and the Chinese public after learning over the weekend that their performance bonuses will be lowered.

Several posts criticized Tesla’s handling of a tragic accident at its largest plant earlier this year and wondered if the reductions were related.

Last year, Musk complimented Tesla’s Shanghai plant’s workers for burning “the 3 a.m. oil” to keep operations running during the city’s two-month COVID lockdown.

Baidu Tieba’s posts started late last week. Some tweeted to Musk, his mother, Maye Musk, and Tesla on Musk’s Twitter, which China blocked.

“Please pay attention to the performance (bonus) of frontline workers at Tesla’s Shanghai factory being arbitrarily deducted,” tweeted @AFeiywu to Elon Musk and Tesla Asia.

Two workers at Tesla’s 20,000-person plant told Reuters that their supervisors warned them over the weekend of a decrease in their quarterly incentive, which is tied to factory performance.

According to workers, Tesla bosses cited a “safety incident” when queried about the incentive drop. However, they declined to be named for job security.

Several online remarks alleged Shanghai manufacturing workers were unfairly penalized for a February labor death.

On February 4, a mechanical mishap in Tesla’s Shanghai welding workshop killed one worker, according to an April 12 Pudong municipal report.

The local government’s investigation found Tesla’s safety management oversight indirectly caused the accident, and the deceased worker was directly accountable.

Tesla and Elon Musk did not respond to inquiries.

China-famous model Maye Musk is his mother. Her memoir tour lasted two weeks.

Some workers posted online that their quarterly incentives were decreased by 2,000 yuan.

Over time, shifts and annual and quarterly bonuses can boost Shanghai plant base pay to 5,340 yuan ($777) monthly.

According to a job post on the state-owned Lingang Group’s official WeChat account, which hires for regional enterprises, workers can make 110,000-120,000 yuan before taxes, including bonuses and overtime. The region’s multinational and Chinese manufacturers pay similarly.

Wednesday is Tesla’s first-quarter report. Investors and analysts will focus on how its electric car pricing reductions have lowered its industry-leading margins.

Last quarter, Tesla Chief Financial Officer Zach Kirkhorn stated Tesla expected to maintain a 20% gross profit on automobiles, excluding leases and regulatory credits, with an average global EV sale price above $47,000.